1. School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece
2. BIOSTATS, Epirus Science and Technology Park Campus of the University of Ioannina, Ioannina, Greece
3. Department of Internal Medicine, Faculty of Medicine, University of Ioannina, Ioannina, Greece
4. Division of Endocrinology and Metabolism and Diabetes Centre, First Department of Internal Medicine, Medical School, Aristotle University of Thessaloniki, Thessaloniki, Greece
5. Second Propedeutic Department of Internal Medicine, Hippokration General Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece