COvid-19 and high-dose VITamin D supplementation TRIAL in high-risk older patients (COVIT-TRIAL): study protocol for a randomized controlled trial.
Trials. 2020 Dec 28;21(1):1031. doi: 10.1186/s13063-020-04928-5.
Trials. 2020.
PMID: 33371905
Free PMC article.
Clinical Trial.