1. Diabetes Center, First Department of Propaedeutic Internal Medicine, Laiko General Hospital, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
2. First Department of Internal Medicine, Sismanogleio General Hospital, 15126 Athens, Greece
3. Department of Pharmacology, National and Kapodistrian University of Athens, 11527 Athens, Greece
4. Second Department of Critical Care, Attikon General University Hospital, Medical School, National and Kapodistrian University of Athens, 12462 Athens, Greece
5. Department of Endocrinology and Metabolism, Evangelismos General Hospital, 10676 Athens, Greece
6. Department of Internal Medicine, Evangelismos General Hospital, 10676 Athens, Greece
7. Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece