quadgram

This is a table of type quadgram and their frequencies. Use it to search & browse the list to learn more about your study carrel.

quadgram frequency
granted medrxiv a license173
display the preprint in173
a license to display173
license to display the173
medrxiv a license to173
who has granted medrxiv173
to display the preprint173
has granted medrxiv a173
the preprint in perpetuity157
the copyright holder for156
copyright holder for this156
is the author funder138
certified by peer review121
which was not certified121
was not certified by121
not certified by peer121
holder for this preprint115
severe acute respiratory syndrome108
made available under a94
it is made available94
international license it is94
is made available under94
license it is made94
this preprint this version82
preprint this version posted82
for this preprint this82
the use of masks74
use of face masks71
reuse allowed without permission64
no reuse allowed without64
a is the author59
under a is the59
available under a is59
this version posted april57
of personal protective equipment55
disease control and prevention52
for disease control and51
of face masks in47
on the use of47
in the context of44
acute respiratory syndrome coronavirus44
is protected by copyright43
a systematic review and43
systematic review and meta43
article is protected by43
this article is protected42
holder for this this41
for this this version41
this this version posted41
the use of a40
the spread of covid39
the face mask group38
the use of face37
the world health organization37
as well as the37
in the case of36
this version posted september35
of severe acute respiratory34
the spread of the33
reduce the spread of33
available under a author32
under a author funder32
the no talking group32
use of cloth masks31
in the united states30
centers for disease control30
it is important to30
face masks in the30
on the other hand29
infection prevention and control29
to wear a mask29
surgical masks and n28
the use of cloth28
of masks in the28
of masks and respirators28
by the general public28
the spread of respiratory27
efficacy of face masks27
use of masks in27
wearing a face mask27
use of personal protective25
efficacy of cloth masks25
in the face mask25
that the use of25
the severe acute respiratory24
in health care workers24
regarding the use of23
in the absence of23
one of the most23
prevent the spread of22
medical masks and respirators22
at the time of22
masks in the community21
of face masks and21
the n o mask21
masks and n respirators21
use of masks and20
respirators and surgical masks20
occupational safety and health20
spread of respiratory viruses20
face masks in public19
with the use of19
the surface of the19
the filtration efficiency of19
the use of surgical19
as a function of19
advice on the use19
reduce the risk of19
center for disease control18
for the use of18
has been shown to18
among health care workers18
influenza transmission in households18
use by the general18
in addition to the18
in the no talking18
masks and respirators against18
interventions to interrupt or17
the context of covid17
interrupt or reduce the17
to prevent the spread17
as a result of17
mask use by the17
the filtration performance of17
and personal protective equipment17
or reduce the spread17
in an influenza pandemic17
physical interventions to interrupt17
at the same time17
to interrupt or reduce17
shedding in exhaled breath16
aerosol and surface stability16
that they have no16
of cloth masks in16
in exhaled breath and16
of cloth masks compared16
slow the spread of16
use and control of16
preprint the copyright holder16
influenza among health care16
with suspected or confirmed16
which was not peer16
and efficacy of face16
national institute for occupational16
this version posted november16
breath and efficacy of16
use of medical masks16
for preventing influenza among16
the centers for disease16
respiratory virus shedding in16
virus shedding in exhaled16
preventing influenza among health16
as compared with sars16
spread of the virus16
and surface stability of16
exhaled breath and efficacy16
face mask use and16
to protect the wearer16
surface stability of sars16
the effect of mask15
in health care settings15
of respiratory virus transmission15
respiratory virus transmission in15
for the prevention of15
to prevent influenza transmission15
rational use of face15
face mask use by15
the type of mask15
at the end of15
mask use and control15
wear a face mask15
health care workers from15
a cluster randomised trial15
control of respiratory virus15
and control of respiratory15
virus transmission in households15
use of cloth face15
personal protective equipment for15
prevent influenza transmission in15
masks in the context15
institute for occupational safety15
in the number of15
for occupational safety and15
patients with suspected or15
of the n mask15
a review of the14
of cloth face coverings14
in the setting of14
of medical masks and14
efficacy of homemade masks14
protect in an influenza14
and eye protection to14
of the efficacy of14
protect the wearer from14
in the healthcare setting14
trial of cloth masks14
among the general population14
eye protection to prevent14
the efficacy of homemade14
the use of facemasks14
middle east respiratory syndrome14
protection to prevent person14
they protect in an14
would they protect in14
physician face mask use14
the mouth and nose14
a face mask in14
the general public to14
transmission of severe acute14
compared with medical masks14
testing the efficacy of14
person transmission of sars14
respirators and medical masks14
the risk of infection14
the efficacy of cloth13
the use of the13
systematic review of the13
masks in the covid13
a large number of13
a randomized intervention trial13
n respirators and surgical13
medical masks in healthcare13
of a face mask13
cluster randomised trial of13
randomised trial of cloth13
was found to be13
the mask and the13
face masks and respirators13
reduce exposure to respiratory13
masks in healthcare workers13
efficacy of medical masks13
transmission of infectious agents13
the no talking scenario13
of the general population13
in the use of13
authors have declared that12
face mask without tape12
the spread of infection12
fit of the mask12
in the community setting12
infections among the general12
effectiveness of n respirators12
respiratory infections among the12
with medical masks in12
false sense of security12
of surgical masks and12
all authors have declared12
use of surgical masks12
to the use of12
reducing the spread of12
of the face mask12
on personal protective equipment12
for health care workers12
masks or face coverings12
protecting health care workers12
face masks reduce exposure12
the efficacy of medical12
to respiratory infections among12
cloth masks compared with12
by severe acute respiratory12
of the novel coronavirus12
the use of ppe12
masks and respirators to12
daily case growth rates12
n respirators and medical12
masks reduce exposure to12
of the general public12
masks compared with medical12
exposure to respiratory infections12
transmission of influenza a12
were in their s12
of this study is11
in the timing of11
personal protective equipment during11
suspended in the air11
for the no talking11
a cluster randomized clinical11
the wearing of masks11
the use of n11
it is not possible11
the effectiveness of masks11
the authors declare that11
the total number of11
different types of masks11
there was no significant11
of n respirators versus11
as shown in figure11
health care workers in11
facemasks and hand hygiene11
use of masks for11
of the surgical mask11
n respirators versus surgical11
it is possible that11
of this study was11
the time of writing11
the effective reproduction number11
to reduce the risk11
respirators versus surgical masks11
protective equipment during the11
the aim of this11
face mask in the11
prevention and control of11
cluster randomized clinical trial11
can be found in11
the size range of11
a randomized clinical trial11
of the filtration performance11
the size of the11
of cloth masks and11
mask in the community11
declare that they have11
of common hand disinfection11
protection for healthcare workers11
the filtration efficiencies of11
and common fabric materials10
authors declare that they10
the nose and mouth10
use of respiratory protection10
the filtration efficacy of10
and a surgical mask10
common fabric materials against10
potential implications for reducing10
clouds and respiratory pathogen10
during the study period10
use of protective masks10
endophthalmitis after intravitreal injection10
gas clouds and respiratory10
implications for reducing transmission10
adequate are surgical masks10
for disease prevention and10
for the protection of10
r o o f10
the number of cases10
members of the general10
the use of respiratory10
of different types of10
made face masks reduce10
the ministry of health10
limit the spread of10
cloth masks and common10
a l p r10
the efficiency of the10
the edge of the10
j o u r10
use of a face10
to prevent transmission of10
the superior portion of10
were found to be10
performance of cloth masks10
use of surgical face10
no significant difference in10
turbulent gas clouds and10
filtration performance of cloth10
transmission of the virus10
healthcare and community settings10
and how adequate are10
the purpose of this10
in the medical mask10
of infection in healthcare10
the theory of planned10
equipment during the covid10
n a l p10
o u r n10
respiratory and facial protection10
masks and common fabric10
in the prevention of10
a false sense of10
p r o o10
in the emergency department10
is not possible to10
a higher risk of10
reducing transmission of covid10
risk of transmission of10
masks and n masks10
fitting face mask without10
of influenza a virus10
and respiratory pathogen emissions10
half of the face10
effect of mask mandates10
is one of the10
the effectiveness of the10
evaluation of the filtration10
of the mask and10
u r n a10
public during the covid10
of the mask is10
l p r e10
the use of these10
disease prevention and control10
is important to note10
for reducing transmission of10
in reducing the spread10
r n a l10
how adequate are surgical10
the national academy of10
and respirators against respiratory10
respirator for preventing influenza9
the cumulative number of9
of wearing a face9
food and drug administration9
and respirators to prevent9
a cluster randomized trial9
associated with the use9
the vast majority of9
new york and washington9
of the population wearing9
for personal protective equipment9
the public during the9
rational use of personal9
the efficacy of face9
suspected or confirmed covid9
vascular endothelial growth factor9
compared to medical masks9
the use of medical9
effectiveness of facemasks in9
and the nonrebreathing mask9
level against airborne viruses9
remain suspended in the9
during the sars outbreak9
wear a surgical mask9
in healthcare and community9
as the number of9
for patients with suspected9
studies have shown that9
is shown in figure9
the transmission of the9
the beginning of the9
the prevention of infection9
to wear face masks9
prevention of infection in9
protection level against airborne9
reduction from peak daily9
influenza and other respiratory9
for the general public9
the efficacy of surgical9
of wearing a mask9
at the university of9
this version posted july9
use of n respirators9
of the population is9
important to note that9
during the no talking9
recommend the use of9
the fit of the9
when a mask is9
group compared to the9
to limit the spread9
the results of this9
of the use of9
of the cloth masks9
other personal protective equipment9
variation in the timing9
face masks for the9
used in this study9
would need to be9
masks and respirators for9
wearing a pollution mask9
the effectiveness of face9
masks to prevent respiratory9
on the surface of9
number of cumulative cases9
the face of the9
n filtering facepiece respirators9
of surgical face masks9
n respirator for preventing9
to account for the9
a surgical mask or8
of common fabrics used8
was no significant difference8
medical masks to prevent8
masks for preventing influenza8
with pneumonia in china8
coronavirus from patients with8
like illness among young8
novel coronavirus from patients8
before and after the8
surgical masks or n8
is defined as the8
surgical masks and respirators8
prevent respiratory virus infection8
do n respirators provide8
of a surgical mask8
infection in health care8
an increase in the8
are summarized in table8
the number of cumulative8
mask group compared to8
on the effectiveness of8
provide protection level against8
this version posted june8
in the wake of8
the new york times8
preventing the spread of8
aerosol filtration efficiency of8
of face masks is8
been shown to be8
the authors declare no8
hygiene to prevent influenza8
contamination by severe acute8
subjects were instructed to8
of infectious agents in8
infections in healthcare workers8
as the use of8
a no talking policy8
surgical mask vs n8
to medical masks to8
n respirators to medical8
to wear a face8
from patients with pneumonia8
it is necessary to8
of the n respirator8
between the mask and8
common fabrics used in8
filtration efficacy of cloth8
patients with pneumonia in8
use of masks by8
as part of the8
the transmission of infectious8
for the public during8
prevent transmission of influenza8
there is also a8
percentage of the population8
european centre for disease8
a novel coronavirus from8
is not sufficient to8
if there is a8
in the size range8
a systematic review of8
efficiency of common fabrics8
there was no difference8
sides of the mask8
cloth masks may be8
to prevent respiratory virus8
hand hygiene to prevent8
to help slow the8
in respiratory cloth masks8
of infection in the8
masks for the public8
for the face mask8
have been shown to8
respirators in health care8
respirators to medical masks8
higher risk of infection8
to reduce the spread8
clinical trial comparing fit8
fabrics used in respiratory8
vs n respirator for8
been found to be8
workers and sick patients8
of the mask to8
increase the risk of8
filtration efficiency of common8
this study was to8
are associated with a8
the use of protective8
in the era of8
effectiveness of face masks8
and the use of8
studies are needed to8
to wear masks in8
review of the efficacy8
healthcare workers and sick8
centre for disease prevention8
the basic reproduction number8
face masks to reduce8
of materials used in8
illness among young adults8
randomized clinical trial comparing8
mask vs n respirator8
the medical mask group8
for each of the8
and hand hygiene to8
subjects wearing a tight8
be found in the8
edge of the mask8
studies have suggested that8
respiratory virus infection in8
face mask to limit8
cases of oral flora8
virus infection in health8
a reduction in the8
a wide range of8
of patients infected with8
used in respiratory cloth8
help slow the spread8
the extent to which8
of nosocomial transmission of8
diamond princess cruise ship8
wearing a surgical mask7
and control recommendations for7
and respirators against coronaviruses7
medical masks for preventing7
the filtration efficiency for7
surgical masks against influenza7
in the vicinity of7
east respiratory syndrome coronavirus7
droplets and contact in7
wear face masks in7
of face masks to7
in close contact with7
an n filtering facepiece7
prevention of nosocomial transmission7
and other respiratory transmissible7
infection in healthcare and7
national academy of sciences7
designed to protect the7
tables a and a7
no conflict of interest7
range of particle sizes7
of the effectiveness of7
among health care personnel7
can be used to7
when an infected person7
that mask mandates were7
to the type of7
effectiveness of masks and7
other respiratory transmissible viruses7
to protect themselves from7
wearing of face masks7
cloth masks in the7
for the purpose of7
of n respirators and7
shortage of personal protective7
surgical and n masks7
respiratory syndrome coronavirus in7
infected with novel coronavirus7
precautions against droplets and7
fewer cfus compared to7
prevention and control recommendations7
in the present study7
in response to the7
of the included studies7
mask to limit the7
the transmission of respiratory7
to the no talking7
use of a mask7
nosocomial transmission of severe7
in protecting health care7
the volume flow rate7
coming into contact with7
transmission of infectious diseases7
n respirators provide protection7
respiratory transmissible viruses for7
workers during the covid7
when and how to7
n or n masks7
on the development of7
fitting face mask with7
the diamond princess cruise7
come in contact with7
masks were found to7
against respiratory infections in7
aerosol transmission of influenza7
effectiveness of masks in7
with a diameter of7
during an intravitreal injection7
the context of the7
rapid systematic review of7
with respect to the7
the spread of droplets7
compared to the no7
is wearing a mask7
the risk of endophthalmitis7
against droplets and contact7
reduction in weekly cases7
of an n filtering7
a mask is worn7
it should be noted7
facemasks for the prevention7
efficiency against viral aerosol7
surgical masks are not7
against coronaviruses and other7
transmissible viruses for the7
and how to use7
the sides of the7
that there is no7
in prevention of nosocomial7
of emerging infectious diseases7
as one of the7
the spread of coronavirus7
masks to protect against7
by the world health7
respirator and a surgical7
preventing the transmission of7
surgical masks in protecting7
in accordance with the7
infection control in health7
in the air for7
use and limited reuse7
a rapid systematic review7
should be noted that7
risk of exposure to7
of precautions against droplets7
were observed in the7
of de novo headache7
the no face mask7
in front of the7
respirators provide protection level7
effectiveness of precautions against7
case of a pandemic7
population is wearing masks7
infection in healthcare workers7
review of the scientific7
a randomized controlled trial7
american society for testing7
of mask mandates on7
respiratory infections in healthcare7
of the scientific evidence7
coronaviruses and other respiratory7
and other respiratory viruses7
type i surgical mask7
in the light of7
respirators against coronaviruses and7
in the fight against7
the use of personal7
effect of surgical masks7
as state policy source7
org as state policy7
interventions for pandemic influenza7
glove and mask use7
surgical mask and n7
and contact in prevention7
of hospitalized patients with7
in a health care7
for infection control in7
contact in prevention of7
by health care workers7
of surgical masks is7
efficacy of n respirators7
the dolfino frontier mask7
and the efficacy of7
wearing masks in public7
viruses for the community7
masks in order to7
in the range of7
the national institute for7
are shown in table7
reduces the risk of7
masks and respirators in7
are shown in figure7
in the air and7
in the face of7
be taken into account7
of face masks by7
the efficacy of masks7
as part of a7
with soap and water7
viral shedding and transmissibility6
efficacy of surgical and6
and transmissibility of covid6
the correct use of6
in the field of6
the size distribution of6
the virus in the6
h n influenza pandemic6
respirators vs medical masks6
as well as for6
guideline for isolation precautions6
wearing an n mask6
care workers from acute6
evaluate the effect of6
the percentage of particles6
surgical face masks and6
cumulative number of cases6
of the filter material6
mask with adhesive tape6
the face and the6
rna concentration of sars6
between the two groups6
the risk of transmission6
the number of new6
in the short term6
for the spread of6
wearing face masks in6
to the general public6
to curtail the covid6
to ensure that the6
by the general population6
the mask or material6
is associated with a6
virus in patients with6
with and without a6
or not to mask6
medrxiv preprint table s6
endophthalmitis following intravitreal injection6
party of the governor6
of the coronavirus disease6
in the operating theatre6
in the supplementary material6
caring for patients with6
times of common hand6
are in short supply6
clinical features of patients6
personal protective equipment contamination6
efficacy and safety of6
occupational health and safety6
mask or not to6
the benefits of wearing6
without a face mask6
quantitative assessment of the6
assumes that mask mandates6
preventing transmission of infectious6
be used in the6
the middle of the6
in compliance with the6
the study was conducted6
masks to protect themselves6
from peak daily case6
masks or n respirators6
on the spread of6
dynamics in viral shedding6
coverings to help slow6
not wearing a mask6
randomised controlled trial to6
of respiratory and facial6
respirators to prevent transmission6
n respirators vs medical6
a controlled comparison in6
public health agency of6
d i f f6
aerodynamic characteristics and rna6
influenza among young adults6
protect against droplet infection6
the addition of a6
the face mask is6
influenza other respir viruses6
in the study by6
cloth face coverings to6
was considered to be6
healthcare workers during the6
endophthalmitis cases in the6
the transmission of covid6
face mask use in6
van doremalen et al6
three different types of6
the potential for face6
health agency of canada6
from acute respiratory infection6
person coughs or sneezes6
of the filtration efficiency6
aerosol generating procedures and6
a simple surgical mask6
vs medical masks for6
we find that the6
personal protective equipment in6
different types of respiratory6
we would like to6
a surgical face mask6
mask mandate at t6
recommendation regarding the use6
general public to curtail6
the case of the6
used in medical face6
wearing a mask is6
is based on the6
the end of the6
face masks should be6
from a symptomatic patient6
in wuhan hospitals during6
and surgical masks are6
performance of an n6
efficacy of surgical masks6
from the world health6
it is possible to6
and n masks to6
the development of a6
assessment of the efficacy6
acute respiratory syndrome among6
respirators against respiratory infections6
and drafting of paper6
and influenza among young6
characteristics and rna concentration6
data source is yougov6
control recommendations for patients6
natural ventilation for infection6
this study is that6
the party of the6
patient face mask use6
face coverings to help6
h n influenza virus6
n masks to filter6
to slow the spread6
with novel coronavirus in6
a surgical mask and6
peak daily case growth6
contact with sars patients6
in patients with acute6
universal face mask use6
for severe acute respiratory6
that there are no6
the protection of the6
modes of transmission of6
little is known about6
types of cloth masks6
respiratory infection in healthcare6
shedding and transmissibility of6
how to use masks6
masks and surgical masks6
mask use in the6
the findings of this6
in order to evaluate6
d d i f6
use of masks to6
and instant hand hygiene6
cloth masks in healthcare6
t d d i6
the spread of disease6
no conflicts of interest6
use of a respirator6
potential for face mask6
temporal dynamics in viral6
more likely to be6
features of patients infected6
without a mask in6
healthcare workers in the6
of surgical and n6
with acute influenza infection6
interim infection prevention and6
on the efficacy of6
masked and unmasked faces6
aerosol in wuhan hospitals6
such as hand hygiene6
on the basis of6
filtration efficiency of the6
equipment contamination by severe6
the onset of the6
reduce the number of6
modeling the potential for6
the different types of6
versus surgical masks in6
an infected person coughs6
the effectiveness of wearing6
panel assumes that mask6
the data source is6
face mask use may6
the effectiveness of facemasks6
masks in protecting health6
at the beginning of6
the pressure drop across6
the mask or respirator6
patients infected with novel6
theory of planned behaviour6
the h n influenza6
for face mask use6
the velocity of the6
and should not be6
workers from acute respiratory6
that face mask use6
by the use of6
the quality of the6
and rna concentration of6
in a bath of6
efficiency of the filter6
do you think that6
protection against droplet infection6
in medical face masks6
influenza virus in patients6
to reduce transmission of6
face masks are not6
front of the mask6
of surgical and cotton6
the population is wearing6
as shown in fig6
wuhan hospitals during covid6
for n respirators and6
and significance level respectively6
no cases of oral6
for a period of6
in the provinces with6
superior portion of the6
all over the world6
that cloth masks are6
patients with acute influenza6
the implementation of the6
were obtained from the6
of aerosol transmission of6
instant hand hygiene for6
control the spread of6
the ability of the6
for the effectiveness of6
use of face mask6
controlled comparison in patients6
has led to a6
on masks and respirators6
of face mask use6
mandates are associated with6
masks in preventing the6
public to curtail the6
masks by the general6
pressure drop across the6
the outer surface of6
advice for the public6
should be reserved for6
in viral shedding and6
effectiveness of surgical masks6
an important role in6
a quantitative assessment of6
to health care workers6
and limited reuse of6
hygiene and infection control6
protective equipment contamination by6
n or n mask6
to mask or not6
to be effective in6
to be used in6
in the event of6
removal of the mask6
the spread of sars6
the edges of the6
ventilation for infection control6
in order to ensure5
a health care setting5
in order to avoid5
play a role in5
from an infected person5
the sars outbreak in5
the mask to the5
the efficacy of the5
authors declare the following5
the majority of the5
percentage of people wearing5
materials used in medical5
hand hygiene for fighting5
are included in the5
mandates in the us5
influenza a h n5
use of respiratory and5
of surgical face mask5
the vicinity of the5
pathways for particle penetration5
of the virus and5
inside of the mask5
interventions on uris and5
and health care worker5
to an increase in5
masks in public places5
to the development of5
the world health organisation5
lower half of the5
in light of the5
and the united states5
superemission during human speech5
surgical and cotton masks5
theory of planned behavior5
public to wear masks5
in the general population5
would like to thank5
bridge of the nose5
the filtration efficiency was5
for pandemic influenza in5
of respiratory protection devices5
no face mask and5
sourcing personal protective equipment5
potential utilities of mask5
on the filtration efficiency5
during the influenza season5
surgical face masks to5
the inside of the5
transmission potential of sars5
the relative efficacy of5
a surgical mask during5
on businesses and gatherings5
the outer borders of5
of using face masks5
a significant impact on5
the base of the5
in direct contact with5
on uris and influenza5
particle release from respirators5
by the national institute5
authors would like to5
for ipc precaution recommendations5
infections in health care5
filtration efficiencies of the5
surgical mask or respirator5
is a lack of5
masks used in the5
the top of the5
number of cases is5
on the performance of5
risk factors for sars5
a better understanding of5
the front of the5
face mask with adhesive5
of masks in reducing5
of health and welfare5
in the form of5
was reported to be5
in the cumulative number5
chinese center for disease5
the airborne lifetime of5
in areas of significant5
of the severity of5
face and the mask5
protection of healthcare workers5
in two wuhan hospitals5
wearing masks to protect5
people wearing a face5
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to talking and coughing5
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claims in published maps5
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mask outside your home5
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aerodynamic analysis of sars5
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ministry of health and5
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viral shedding observed at5
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airborne transmission of sars4
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this version posted may4
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safety and health administration4
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report of the who4
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purpose of this study4
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the face fit factor4
the mask and adapter4
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the number of people4
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review of the infection4
portacount respirator fit tester4
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the authors have no4
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cotton masks in blocking4
reporting items for systematic4
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protection clinical microbiology reviews4
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our results suggest that4
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masks for the general4
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each mask was quantified4
the average of the4
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the range of the4
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evidence about the benefits4
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the impact of covid4
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incubation period of coronavirus4
it is expected that4
cases and lagged case4
have declared that they4
binary variable taking value4
airborne transmission of infectious4
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to the surface of4
nm particles was observed4
contact with the patient4
that the application of4
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standard of care for4
of a randomized trial4
in the community during4
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systematic review physical interventions4
the occurrence of headache4
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universal masking and successful4
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statistical analysis and drafting4
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small fraction of the4
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masks in health workers4
infections during sars outbreak4
community use of masks4
a binary variable taking4
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a flow rate of4
of commercially available masks4
materials and methods section4
china joint mission on4
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the efficacy of n4
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preliminary findings of a4
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barriers to the use4
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droplets and their potential4
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as soon as they4
any organizations that might4
lockdown with social distancing4
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equipment for healthcare workers4
distribution and sale of4
masks should be reserved4
medicine and public health4
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supply of surgical masks4
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impact of mask mandates4
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reduce the rate of4
of transmission of acute4
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droplets spread beyond the4
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the lancet infectious diseases4
when the number of4
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the risk of cross4
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the integrity of the4
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sars among persons without4
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the spread of a4
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mask mandates on covid4
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options for n respirators4
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figure plots the average4
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a large academic medical4
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the effectiveness of universal4
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of cloth facemasks in4
the n mask was4
early universal masking and4
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province with repetitions are4
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the severity of the4
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