id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-326085-2dt758qj	Patanavanich, Roengrudee	Smoking Is Associated With COVID-19 Progression: A Meta-analysis	2020-05-11		.txt	text/plain	2234	135	56	Studies reporting smoking behavior of COVID-19 patients and progression of disease were selected for the final analysis. We conducted a systematic search using PubMed on April 28, 2020, with the search term: ((smoking) OR (characteristics) OR (risk factors) OR (outcomes) OR (smoker*)) AND ((COVID-19) OR (COVID) OR (coronavirus) OR (sars cov-2) OR (sars cov 2)) for studies published between January 1, 2020 and April 28, 2020. A total of 907 studies were retrieved through the search, of which 19, 8-26 16 from China, 1 from Korea, and 2 from the United States, included data on smoking behavior and COVID-19 disease progression (Supplementary Table S1 ). Three peer-reviewed meta-analysis papers 6, 34, 35 on association between smoking and COVID-19 were also based on unadjusted ORs, but with fewer studies included. Retrospective study of risk factors for severe SARS-Cov-2 infections in hospitalized adult patients	./cache/cord-326085-2dt758qj.txt	./txt/cord-326085-2dt758qj.txt