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Navas-Nacher, Elena L.. (2001). Risk Factors for Coronary Heart Disease in Men 18 to 39 Years of Age. Annals of Internal Medicine, 134(6), 433–. doi:10.7326/0003-4819-134-6-200103200-00007 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research