1. Endocrine Unit, Second Department of Internal Medicine-Propaedeutic, Research Institute and Diabetes Center, Athens University Medical School, Attikon University Hospital, Athens, Greece;
2. First Department of Pathology, Athens University Medical School;
3. Department of Surgery, Patision General Hospital
4. Second Department of Internal Medicine-Propaedeutic, Research Institute and Diabetes Center, Athens University Medical School, Attikon University Hospital, Athens, Greece;
5. Hellenic National Diabetes Center for the Research, Prevention and Treatment of Diabetes and its Complications, H.N.D.C, Athens, Greece