id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-280437-6u3kepat	Kalippurayil Moozhipurath, R.	Evidence of Protective Role of Ultraviolet-B (UVB) Radiation in Reducing COVID-19 Deaths	2020-05-12		.txt	text/plain	6136	378	58	We use the cumulative number of COVID-19 deaths and case-fatality rate (CFR) as the main dependent variables to test our hypothesis and isolate UVI effect from potential confounding factors such as underlying time trends, country-specific time-constant and time-varying factors such as weather. The corresponding country level data consist of the cumulative daily COVID-19 deaths and infections, the daily ultraviolet index (UVI), which is closely connected to the daily UVB radiation, and a set of control variables such as daily weather parameters such as precipitation index, cloud index, ozone level, humidity level, as well as minimum and maximum temperature. The effect of UVI is isolated from time-constant country-specific factors (see Figure 1 ) by using a within-transformation of the transformed structural model as The key finding is the significant negative long-run association of UVI on cumulative COVID-19 deaths.	./cache/cord-280437-6u3kepat.txt	./txt/cord-280437-6u3kepat.txt