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Tai, Fei-Wu; Chang, Cherry; Chiang, Jen-Huai; Lin, Wu-Chou; Wan, Lei . (2018). Association of Pelvic Inflammatory Disease with Risk of Endometriosis: A Nationwide Cohort Study Involving 141,460 Individuals. Journal of Clinical Medicine, 7(11), 379–. doi:10.3390/jcm7110379 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research