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Marrie, R. A.; Cohen, J.; Stuve, O.; Trojano, M.; Sorensen, P. S.; Reingold, S.; Cutter, G.; Reider, N. . (2015). A systematic review of the incidence and prevalence of comorbidity in multiple sclerosis: Overview. Multiple Sclerosis Journal, 21(3), 263–281. doi:10.1177/1352458514564491 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research