Rhodes et al., BMJ Nutr. Prev. Health, doi:10.1136/bmjnph-2020-000110 (Peer Reviewed) COVID-19 mortality increases with northerly latitude after adjustment for age suggesting a link with ultraviolet and vitamin D
Analysis of COVID-19 mortality and latitude as of May 18, 2020, showing that latitude was significantly associated with mortality (p=0.031), with an estimated 4.4% [0.4%-8.5%] increase in mortality for each 1° further north.
Rhodes et al., 6/14/2020, peer-reviewed, 5 authors.