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

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