Vitamin D Deficiency and Comorbidities as Risk Factors of COVID-19 Infection: A Systematic Review and Meta-analysis
Pinki Mishra, Rizwana Parveen, Ram Bajpai, Nidhi Agarwal
J Prev Med Public Health. 2022;55(4):321-333.   Published online 2022 Jun 13     DOI: https://doi.org/10.3961/jpmph.21.640
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Methodological issues in designing and reporting of systematic reviews in assessing association between vitamin D supplementation and COVID-19 severity
R Bajpai
QJM: An International Journal of Medicine.2022;[Epub]     CrossRef