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The effects of vitamin D supplementation on (A) SARS-CoV-2 RNA positivity in asymptomatic or mildly symptomatic patients with COVID-19 [17, 122] and (B) all-cause mortality [16, 125] or (C) ICU admission [16, 125] in moderate-to-severe COVID-19 patients. COVID-19, coronavirus disease 2019; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2; CI, confidence interval; ICU, intensive care unit; M-H, Mantel–Haenszel method
