1. Endocrine Unit, Athens Medical Centre , 65403 Athens , Greece
2. Division of Endocrinology and Metabolism, Department of Internal Medicine, Hacettepe University School of Medicine , Ankara 06100 , Turkey
3. Unit of Endocrinology, Diabetes Mellitus and Metabolism, Aretaieion Hospital, Faculty of Medicine, National and Kapodistrian University of Athens , 11528 Athens , Greece
4. Unit of Endocrinology and Diabetes Prevention and Care, IRCCS Azienda Ospedaliero-Universitaria di Bologna, University of Bologna , 40138 Bologna , Italy
5. Department of Endocrinology, Centro Hospitalar Universitário S. João and Faculty of Medicine of the University of Porto , 4200 – 319 Porto , Portugal
6. Section of Internal Medicine, Endocrinology, Andrology and Metabolic Diseases, Department of Precision and Regenerative Medicine and Ionian Area, University of Bari Aldo Moro , 70121 Bari , Italy
7. Department of Endocrinology, Odense University Hospital , 5000 Odense , Denmark
8. Universitätsklinik für Innere Medizin, Klinische Abteilung Endokrinologie und Diabetologie und Universitätsklinik für Frauenheilkunde & Geburtshilfe Medizinische Universität Graz , 8036 Graz , Austria
9. Clinic for Endocrinology, Diabetes and Metabolic Diseases, Faculty of Medicine, University of Belgrade , 11000 Belgrade , Serbia