1. Outpatient Clinic of Obesity, Diabetes and Metabolism, Second Department of Internal Medicine, Democritus University of Thrace, Alexandroupolis, Greece
2. Department of Medical Statistics, Medical School, Democritus University of Thrace, Alexandroupolis, Greece
3. Department of Internal Medicine and Gastroenterology, University of Thessaly, Larissa, Greece
4. Health Centres, Pieria, Greece
5. Diabetes Centre, General Hospital “Papageorgiou,” Thessaloniki, Greece