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Velly, Ana Miriam; Mohit, Shrisha . (2017). Epidemiology of pain and relation to psychiatric disorders. Progress in Neuro-Psychopharmacology and Biological Psychiatry, (), S027858461730194X–. doi:10.1016/j.pnpbp.2017.05.012 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research