Pak H. Chung, MD is an Associate Professor of Obstetrics and Gynecology and Reproductive Medicine in the Ronald O. Perelman and Claudia Cohen Center for Reproductive Medicine at Weill Medical College of Cornell University, New York Presbyterian Hospital, New York, NY, USZev Rosenwaks, MD, is the Director and Physician-in-Chief of the Ronald O. Perelman and Claudia Cohen Center for Reproductive Medicine; he is the Revlon Distinguished Professor of Reproductive Medicine in Obstetrics and Gynecology and Professor of Obstetrics and Gynecology and Reproductive Medicine at Weill Medical College of Cornell University, New York Presbyterian Hospital, New York, NY, USA