It's amazing how, dozens/hundreds of studies and months into the research of COVID-19 and Vitamin D and given the quality of the research it's STILL impossible to know the answer to the only important question (does supplementation do anything?) with any certainty
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That's not true. Allocation concealment means concealing the order of randomisation from the people allocating participants. In this study, as they say in the methods, the physicians conducting the randomisation had access to the randomisation schedule
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