*quasi ugh
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What in the world is a "quasi-experiment"? From the abstract, it sounds like an observational study.
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Quasi experiments are studies using observational data which try to exploit some random-like feature of the data generating process to estimate causal effects. This appears to be nothing of the sort; and reflects a fundamental lack of understanding of how these methods work.
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Any chance you'll be doing a review on this one as well?
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Vitamin D is a negative acute phase reactant, so it will always appear to be low when there is inflammation happening!!
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