1. Center for Adolescent Medicine and UNESCO Chair on Adolescent Health Care; First Department of Pediatrics; School of Medicine; National and Kapodistrian University of Athens; ‘Aghia Sophia’ Children's Hospital; Athens Greece
2. Cardiovascular and Thoracic Surgery Department; General Hospital of Athens ‘Evangelismos’; Athens Greece
3. Division of Endocrinology, Metabolism and Diabetes; First Department of Pediatrics; School of Medicine; National and Kapodistrian University of Athens; ‘Aghia Sophia Children's Hospital; Athens Greece
4. Division of Endocrinology and Metabolism; Clinical Research Center; Biomedical Research Foundation of the Academy of Athens; Athens Greece