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Williams, S. B.; O'Connor, E. A.; Eder, M.; Whitlock, E. P. . (2009). Screening for Child and Adolescent Depression in Primary Care Settings: A Systematic Evidence Review for the US Preventive Services Task Force. PEDIATRICS, 123(4), e716–e735. doi:10.1542/peds.2008-2415 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research