George P. Chrousos, MD, MACP, MACE, FRCP, is in the Unit of Endocrinology, Metabolism and Diabetes, First Department of Paediatrics, National University of Athens Medical School, Greece. He served as a Distinguished Visiting Scientist at the National Institute of Child Health and Human Development. He is among the most cited clinical investigators in the areas of Clinical Medicine, Biology and Biochemistry. Gregory A. Kaltsas, MD, FRCP, teaches at the Division of Endocrinology, Department of Pathophysiology, Medical School, National and Kapodistrian University of Athens, Greece.