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Longo, Dan L.; Zondervan, Krina T.; Becker, Christian M.; Missmer, Stacey A. . (2020). Endometriosis. New England Journal of Medicine, 382(13), 1244–1256. doi:10.1056/NEJMra1810764 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research