1. School of Medicine, National and Kapodistrian University of Athens, 11527 Athens, Greece
2. Department of Histology-Embryology, School of Medicine, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
3. Department of Endocrinology, Diabetes Mellitus and Metabolism, Aretaieion Hospital, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece