Kronenberg HM, Melmed S, Larsen PR, Polonsky KS. Principles of endocrinology. In: Melmed S, Polonsky KS, Larsen PR, Kronenberg HM, eds. Williams Textbook of Endocrinology. 11th ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 1.
Robert Hurd, MD, Professor of Endocrinology and Health Care Ethics, Xavier University, Cincinnati, OH. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.