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SARS-CoV-2 positivity rates associated with circulating 25-hydroxyvitamin D levels
- Harvey W. Kaufman,
- Justin K. Niles,
- Martin H. Kroll,
- Caixia Bi,
- Michael F. Holick

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- Published: September 17, 2020
- https://doi.org/10.1371/journal.pone.0239252