Papadimitriou et al., World J. Virology,
doi:10.5501/wjv.v10.i3.111] (Peer Reviewed)
Association between population vitamin D status and SARS-CoV-2 related serious-critical illness and deaths: An ecological integrative approach
Country analysis showing negative correlations between population vitamin D level and severe cases and death (but not with cases overall). Authors conclude that higher vitamin D levels may protect from severe cases and death, even more so in the elderly.
Papadimitriou et al., 5/25/2021, peer-reviewed, 3 authors.