1. Department of Anesthesiology, Agia Sophia Children’s Hospital, 11527 Athens, Greece
2. First Department of Neurology, Eginition University Hospital, Medical School, National and Kapodistrian University of Athens, 15772 Athens, Greece
3. Department of Anesthesiology, Faculty of Medicine, University of Thessaly, 41500 Larisa, Greece
4. First Department of Surgery, Metaxa Cancer Hospital, 18537 Piraeus, Greece
5. Department of Emergency Medicine, Tzaneio General Hospital, 18543 Piraeus, Greece
6. Department of Medical Oncology, Metropolitan Hospital, 10461 Piraeus, Greece
7. High Dependency Unit, General Hospital of Syros Vardakeio and Proio, 84100 Syros, Greece
8. Institute for Translational Medicine and Therapeutics, School of Medicine, University of Pennsylvania Perelman, Philadelphia, PA 19104, USA
9. Outcomes Research Consortium, Cleveland, OH 44195, USA