Pal et al., Journal of Endocrinological Investigation,
doi:10.1007/s40618-021-01614-4 (Peer Reviewed) (meta analysis)
Vitamin D supplementation and clinical outcomes in COVID-19: a systematic review and meta-analysis
Meta analysis of 13 vitamin D treatment studies, showing significantly lower ICU admission/mortality with treatment.
Pal et al., 6/24/2021, peer-reviewed, 6 authors.