1. American Center for Reproductive Medicine, Cleveland Clinic, Cleveland, OH, USA.
2. Fertility and In Vitro Fertilization Unit, Department of Obstetrics and Gynecology, Soroka University Medical Center, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beersheba, Israel.
3. Department of Medical Biology, Ondokuz Mayis University Faculty of Medicine, Samsun, Turkey.
4. Division of Medical Physiology, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, South Africa.