1 Dept. of Intensive Care Medicine, University of Ioannina, Ioannina, Greece. Electronic address: gppthan@uoi.gr.
2 Dept. of Internal Medicine and Pediatrics, Ghent University, Ghent, Belgium.
3 UQ Centre for Clinical Research, Faculty of Medicine, The University of Queensland, Brisbane, Australia; Critical Care Department, King's College Hospital NHS Foundation Trust, London, United Kingdom.