1. Diabetes Centre, General Hospital “PAPAGEORGIOU”, Thessaloniki, Greece
2. Diabetes Clinic, 2 nd Department of Internal Medicine, Democritus University of Thrace, Alexandroupolis, Greece
3. Second Propedeutic Department of Internal Medicine, Hippokration University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
4. Diabetes Clinic, First Department of Internal Medicine, General Hospital of Kavala, Greece
5. Diabetes Clinic, Venizelion Hospital, Heraklion, Crete, Greece
6. Health Centre, Kassandria, Halkidiki, Greece