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Sridhar, Aparna; Cwiak, Carrie A.; Kaunitz, Andrew M.; Allen, Rebecca H. . (2017). Contraceptive Considerations for Women with Gastrointestinal Disorders. Digestive Diseases and Sciences, 62(1), 54–63. doi:10.1007/s10620-016-4383-z 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research