1Harvard Reproductive Endocrine Sciences Center and the Reproductive Endocrine Unit of the Department of Medicine, Massachusetts General Hospital, Boston, USA
2Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology, University of Patras Medical School, Patras, Greece
3Mount Auburn Hospital, Harvard Medical School Teaching Hospital, Cambridge, USA
4Department of Pediatrics, Medical School, Aristotle University of Thessaloniki, Thessaloniki, Greece