Second Department of Critical Care, Medical School, Attikon General University Hospital, National and Kapodistrian University of Athens, 1 Rimini St, 12462, Haidari, Greece. eikaras1@gmail.com. Department of Internal Medicine and Endocrinology, Evangelismos General Hospital of Athens, 45-47 Ypsilantou St., 10676, Athens, Greece. Department of Nutrition, Exercise, and Sports, University of Copenhagen, Copenhagen, Denmark. Division of Endocrinology, Diabetes and Hypertension, Brigham and Womens Hospital, Harvard Medical School, 221 Longwood Avenue, Boston, MA, 02115, USA. Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 75 Mikras Asias St, 11527, Athens, Greece.