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Autier, Philippe; Boniol, Mathieu; Pizot, Cécile; Mullie, Patrick . (2014). Vitamin D status and ill health: a systematic review. The Lancet Diabetes & Endocrinology, 2(1), 76–89. doi:10.1016/S2213-8587(13)70165-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research