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https://scholar.google.com/scholar_lookup?title=Guidelines%20for%20optimizing%20design%20and%20analysis%20of%20clinical%20studies%20of%20nutrient%20effects&author=Heaney,+R.P.&publication_year=2014&journal=Nutr.+Rev.&volume=72&pages=48%E2%80%9354&doi=10.1111/nure.12090