1 Unit of Reproductive Endocrinology, First Department of Obstetrics and Gynecology, Medical School, Aristotle University of Thessaloniki, Greece; Department of Obstetrics and Gynecology, 'Carol Davila' University of Medicine and Pharmacy, Department of Obstetrics and Gynecology, 'Dr. I. Cantacuzino' Hospital, Bucharest, Romania; Breast Clinic and Menopause Clinic, University Hospital, De Pintelaan 185, 9000 Gent, Belgium; Second Department of Obstetrics and Gynecology, National and Kapodestrian University of Athens, Greece; University Women's Hospital of Tuebingen, Calwer Street 7, 72076 Tuebingen, Germany; Department of Obstetrics and Gynecology, Zaragoza University Faculty of Medicine, Lozano-Blesa University Hospital, Zaragoza 50009, Spain; Women's Centre, John Radcliffe Hospital, Oxford OX3 9DU, UK; Istanbul University Cerrahpasa School of Medicine, Dept. of Obstetrics and Gynecology, Division of Reproductive Endocrinology, IVF Unit, Istanbul, Turkey; Department of Clinical and Experimental Medicine, University of Pisa, Via Roma, 67, 56100 Pisa, Italy; National Heart and Lung Institute, Imperial College London, Royal Brompton Hospital, London SW3 6NP, UK; Department of Obstetrics and Gynecology, University Women's Hospital, Bern, Switzerland; Menopause and Metabolic Bone Disease Unit, Hôpital Paule de Viguier, CHU Toulouse, Toulouse, France; Unit of Reproductive Endocrinology, First Department of Obstetrics and Gynecology, Medical School, Aristotle University of Thessaloniki, Greece. Electronic address: anagnwstis.pan@yahoo.gr.
2 Unit of Reproductive Endocrinology, First Department of Obstetrics and Gynecology, Medical School, Aristotle University of Thessaloniki, Greece; Department of Obstetrics and Gynecology, 'Carol Davila' University of Medicine and Pharmacy, Department of Obstetrics and Gynecology, 'Dr. I. Cantacuzino' Hospital, Bucharest, Romania; Breast Clinic and Menopause Clinic, University Hospital, De Pintelaan 185, 9000 Gent, Belgium; Second Department of Obstetrics and Gynecology, National and Kapodestrian University of Athens, Greece; University Women's Hospital of Tuebingen, Calwer Street 7, 72076 Tuebingen, Germany; Department of Obstetrics and Gynecology, Zaragoza University Faculty of Medicine, Lozano-Blesa University Hospital, Zaragoza 50009, Spain; Women's Centre, John Radcliffe Hospital, Oxford OX3 9DU, UK; Istanbul University Cerrahpasa School of Medicine, Dept. of Obstetrics and Gynecology, Division of Reproductive Endocrinology, IVF Unit, Istanbul, Turkey; Department of Clinical and Experimental Medicine, University of Pisa, Via Roma, 67, 56100 Pisa, Italy; National Heart and Lung Institute, Imperial College London, Royal Brompton Hospital, London SW3 6NP, UK; Department of Obstetrics and Gynecology, University Women's Hospital, Bern, Switzerland; Menopause and Metabolic Bone Disease Unit, Hôpital Paule de Viguier, CHU Toulouse, Toulouse, France; Unit of Reproductive Endocrinology, First Department of Obstetrics and Gynecology, Medical School, Aristotle University of Thessaloniki, Greece.