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Sure, but it would rule out that Vitamin D is harmful wrt. COVID-19, right? And you could look at the subset of data where people have a high vitamin D level d
by captainmuon 5y ago
Sure, but it would rule out that Vitamin D is harmful wrt. COVID-19, right?
And you could look at the subset of data where people have a high vitamin D level due to supplements. If there is still a relationship there, then the argument for a causal relationship would be stronger.