1 Diabetes Center, Division of Endocrinology and Metabolism, First Department of Internal Medicine, Medical School, Aristotle University of Thessaloniki, AHEPA University Hospital, Thessaloniki, Greece.
2 Diabetes Center, Department of Internal Medicine, Konstantopouleio Hospital, Athens, Greece.
3 Diabetes Center, Division of Endocrinology and Metabolism, First Department of Internal Medicine, Medical School, Aristotle University of Thessaloniki, AHEPA University Hospital, Thessaloniki, Greece - kalmanthou@yahoo.gr.