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Kang, Sung-Yeon; Deren, Sherry; Colón, Hector M. . (2011). Differential gender effects of depression on use of HIV medications among HIV-positive Puerto Rican drug users. AIDS Care, 23(11), 1467–1471. doi:10.1080/09540121.2011.565022 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research