1. IVF Unit, Department of Obstetrics and Gynecology, Fırat University Medical School, Elazig, Turkey
2. Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, Istanbul University Cerrahpasa Medical School, Istanbul, Turkey
3. Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, Texas