Fig. 2From: Effect of vitamin D supplementation versus placebo on recovery delay among COVID-19 Tunisian patients: a randomized-controlled clinical trialPatients flow diagram. One hundred thirty patients were eligible. A total of 117 patients were randomized into 2 groups: 57 patients (48.7%) in the vitamin D supplementation group and 60 (51.3%) in the control group. RT-PCR, reverse transcription-polymerase chain reactionBack to article page