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Espiritu, Rachel P.; Kearns, Ann E.; Vickers, Kristin S.; Grant, Clive; Ryu, Euijung; Wermers, Robert A. . (2011). Depression in Primary Hyperparathyroidism: Prevalence and Benefit of Surgery. The Journal of Clinical Endocrinology & Metabolism, 96(11), E1737–E1745. doi:10.1210/jc.2011-1486 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research