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Layton, J. Bradley; Li, Dongmei; Meier, Christoph R.; Sharpless, Julie; Stürmer, Til; Jick, Susan S.; Brookhart, M. Alan . (2014). Testosterone Lab Testing and Initiation in the United Kingdom and the United States, 2000–2011. The Journal of Clinical Endocrinology & Metabolism, (), jc.2013-3570–. doi:10.1210/jc.2013-3570 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research