1. Unit of Reproductive Endocrinology; First Department of Obstetrics and Gynecology; Medical School; Aristotle University of Thessaloniki; Thessaloniki Greece
2. Second Department of Obstetrics and Gynecology; National and Capodestrian University of Athens; Athens Greece
3. National Heart and Lung Institute; Imperial College London; Royal Brompton and Harefield NHS Foundation Trust; London UK