Frauke von Versen-Höynck1, Kirk P Conrad2, Valerie L Baker3. 1. Division of Gynecologic Endocrinology and Reproductive Medicine, Department of Obstetrics, Gynecology and Reproductive Medicine, Hannover Medical School, Hannover, Germany. 2. Department of Physiology and Functional Genomics and Department of Obstetrics and Gynecology, University of Florida College of Medicine, Gainesville Florida. 3. Division of Reproductive Endocrinology and Infertility, Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Lutherville, Maryland.