1. Department of Intensive Care Medicine, University Hospital of Ioannina, 45500 Ioannina, Greece
2. UQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Brisbane, QL 4029, Australia
3. Second Critical Care Department, Attikon University Hospital, Rimini Street, 12462 Athens, Greece
4. Department of Internal Medicine & Pediatrics, Ghent University, 9000 Ghent, Belgium