them were black; Despite adjustments to many possible confounding factors, there may still be undiscovered factors.
Rosenberg et al[60] Retrospective multicenter cohort study HCQ group:n = 271;HCQ ＋azithromycin group:n = 735control group:n = 221 HCQ:200 mg/400 mg/600 mg/other/unknown, frequency: once a day/twice a da