Department of Gynecology and Obstetrics, Cantonal Hospital Schaffhausen, Geissbergstrasse 81, 8208, Schaffhausen, Switzerland. dimkal1991@windowslive.com. Society of Junior Doctors, Athens, Greece. dimkal1991@windowslive.com. Society of Junior Doctors, Athens, Greece. Section of Investigative Medicine, Division of Diabetes, Endocrinology & Metabolism, Department of Medicine, Imperial College London, London, UK. First Department of Surgery, National and Kapodistrian University of Athens, Laikon General Hospital, Athens, Greece. Department of Gynecology, University Hospital Zurich, Zurich, Switzerland. Unit for Human Reproduction, 1st Department of Obstetrics and Gynecology, Aristotle University of Thessaloniki, Thessaloniki, Greece. Unit of Reproductive Endocrinology, 1st Department of Obstetrics and Gynecology, Aristotle University of Thessaloniki, Thessaloniki, Greece.