Re:Covid-19 is becoming less deadly in Europe but we don't k...
by ivars on Saturday August 29, 2020 @11:14AM
(#24316626)
There are many. For example:
https://link.springer.com/article/10.1007/s40618-020-01370-x
https://www.webmd.com/lung/news/20200518/more-vitamin-d-lowe...
https://www.yalemedicine.org/stories/vitamin-d-covid-19/