1. Unit of Reproductive Endocrinology, 1st Department of Obstetrics and Gynecology, Medical School, Aristotle University of Thessaloniki, Thessaloniki, Greece
2. 2nd Department of Obstetrics and Gynecology, National and Kapodistrian University of Athens, Medical School, Athens, Greece
3. National Heart and Lung Institute, Imperial College London, Royal Brompton and Harefield Hospitals, Guy’s and St Thomas’ NHS Foundation Trust, London, UK