SARS-CoV-2 positivity rates associated with circulating 25-hydroxyvitamin D levels
PLoS ONE (2020) - Comment
doi: 10.1371/journal.pone.0239252  issn: 1932-6203  pubmed: 32941512 

Harvey W. Kaufman, Justin K. Niles, Martin H. Kroll, Caixia Bi, Michael F. Holick