Gerasimos Tsourouflis1, Apostolos Angelis1, Georgios Boutzios2. 1. Second Department of Propaedeutic Surgery, Medical School, National and Kapodistrian University of Athens, Athens, Greece. 2. Endocrine Unit, Department of Pathophysiology, Medical School, National and Kapodistrian University of Athens, Athens, Greece. gboutzios@med.uoa.gr.