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Schiller, Lawrence R.; Pardi, Darrell S.; Sellin, Joseph H. . (2016). Chronic Diarrhea: Diagnosis and Management. Clinical Gastroenterology and Hepatology, (), S1542356516305018–. doi:10.1016/j.cgh.2016.07.028 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research