1. 1Endocrine Unit, 1st Department of Internal Medicine, Laiko Hospital, National and Kapodistrian University of Athens, Athens, Greece
2. 2Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, Athens, Greece
3. 3Warwickshire Institute for the Study of Diabetes, Endocrinology and Metabolism (WISDEM), University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK
4. 4Endocrine Unit, 1st Department of Propaedeutic Medicine, Laiko University Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
5. 5First Department of Pediatrics, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece