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K. A. Stockton; K. Mengersen; J. D. Paratz; D. Kandiah; K. L. Bennell. (2011). Effect of vitamin D supplementation on muscle strength: a systematic review and meta-analysis. , 22(3), 859–871. doi:10.1007/s00198-010-1407-y 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research