1. First Department of Internal Medicine, Unit of Endocrinology, Laikon General hospital, National and Kapodistrian University of Athens, Athens, Greece
2. Hematology Oncology Unit, Fourth Department of Internal Medicine, Attikon University Hospital, National and Kapodistrian University of Athens, Athens, Greece
3. Endocrinology Diabetes and Metabolism Department, 251 Hellenic Air Force and VA General Hospital, Athens, Greece
4. First Propaedeutic Department of Internal Medicine, Endocrine Unit, National and Kapodistrian University of Athens, Athens, Greece