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Rebholz, C. M.; Friedman, E. E.; Powers, L. J.; Arroyave, W. D.; He, J.; Kelly, T. N. . (2012). Dietary Protein Intake and Blood Pressure: A Meta-Analysis of Randomized Controlled Trials. American Journal of Epidemiology, 176(suppl 7), S27–S43. doi:10.1093/aje/kws245 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research