Niki Katsiki1, Christos Mantzoros2. 1. First Department of Internal Medicine, Division of Endocrinology and Metabolism, Diabetes Center, Medical School, AHEPA University Hospital, Thessaloniki, Greece. Electronic address: nikikatsiki@hotmail.com. 2. Metabolism, Clinical and Experimental and Beth-Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, United States of America.