1. Department of Anesthesiology, Agia Sophia Children’s Hospital, 15773 Athens, Greece
2. First Department of Neurology, Eginition University Hospital, Medical School, National and Kapodistrian University of Athens, 11528 Athens, Greece
3. Department of Anesthesiology, G. Gennimatas General Hospital, 54635 Thessaloniki, Greece
4. Department of General Surgery, Metaxa Hospital, 18537 Piraeus, Greece
5. Department of Medical Oncology, Metropolitan Hospital, 18547 Piraeus, Greece
6. Department of Surgical, Oncological and Oral Science (Di.Chir.On.S.), University of Palermo, 90133 Palermo, Italy
7. Department of Emergency Medicine, Faculty of Medicine, University of Thessaly, 41500 Larisa, Greece
8. Department of Anesthesiology, Faculty of Medicine, University of Thessaly, 41500 Larisa, Greece
9. Institute for Translational Medicine and Therapeutics, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104-5158, USA
10. Outcomes Research Consortium, Cleveland, OH 44195, USA