The problem with most published item-level analyses, known since at least 2009. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2686655/ …pic.twitter.com/SkW3zVvwij
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And not done yet it seems. This study is from Spring 2017.http://mankindquarterly.org/archive/issue/57-3/15 …
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