> the other is dubious, it seems to be the one that combines with hydroxychloroquine "standard of care". I believe you're referring to this one, the RCT run in

> the other is dubious, it seems to be the one that combines with hydroxychloroquine "standard of care". I believe you're referring to this one, the RCT run in a hospital in Spain, with a startlingly huge effect size: https://www.sciencedirect.com/science/article/pii/S0960076020302764 https://www.sciencedirect.com/science/article/pii/S096007602... It seems that giving all patients hydroxychloroquine and azithromycin was the policy at that hospital at the time the experiment was run, so the RCT didn't vary that between control and experimental groups; they just gave vitamin D pills to one group and not the other. Is there some problem with this?