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Mayo Clinic
Harvard University Press
Annals of Internal Medicine | April 12, 2013 | Volume: 158 | Issue: 6 | Pages: 500-501
10.7326/0003-4819-158-6-201303190-00020
The Journal of Clinical Endocrinology & Metabolism | December 16, 2008 | Volume: 94 | Issue: 3 | Pages: 709-728
10.1210/jc.2008-1410