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In the article “Clinical Case Seminar: Isolated Prolactin Deficiency Associated With Serum Autoantibodies Against Prolactin-Secreting Cells” by Shintaro Iwama, Corrine K. Welt, Christopher J. Romero, Sally Radovick, and Patrizio Caturegli (J Clin Endocrinol Metab 98:3920–3925, 2013; doi:10.1210/jc.2013-2411), the affiliation for one of the authors was entered in error by the printer. The correct affiliation for Corrine K. Welt is Reproductive Endocrine Unit, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114. The printer apologizes for the error.