Serum Calcium and Vitamin D levels: Correlation with severity of COVID-19 in hospitalized patients in Royal Hospital, Oman.

Int J Infect Dis · 2021 · PMC8057687 · PMID 33892191

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Serum 25(OH)D concentrations usually tend to decrease with age, which may be significant in this COVID-19 pandemic, since case-fatality rates (CFRs) increase with age ( CDC Weekly C, 2020 , Vásárhelyi et al., 2011 ) .

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