1. Elisabeth Paramythiotou, MD, PhD, NHS director, 2nd department of Critical Care Unit, Attikon University Hospital, Athens, Greece. 2. Christina Routsi, MD, Full Professor, 1st department Critical Care Unit, Evangelismos General Hospital, Athens, Greece. 1. Medical School, Aristotle University of Thessaloniki. 2. School of Medicine, national and Kapodestrian University of Athens.