1. Clinic for Endocrinology, Diabetes and Metabolic Disorders Clinical Centre of Vojvodina Novi Sad Serbia
2. Medical Faculty University of Novi Sad Novi Sad Serbia
3. Second Propedeutic Department of Internal Medicine, General Hospital “Hippokration” Aristotle University of Thessaloniki Thessaloniki Greece
4. Second Department of Cardiology, General Hospital “Hippokration” Aristotle University of Thessaloniki Thessaloniki Greece
5. Diabetes Centre, Second Department of Internal Medicine Democritus University of Thrace, University Hospital of Alexandroupolis Alexandroupoli Greece