1. Department of Anesthesiology, Agia Sophia Children’s Hospital, Athens, Greece
2. First Department of Neurology, Eginition University Hospital, Medical School, National and Kapodistrian University of Athens, Athens, Greece
3. Department of Anesthesiology, Faculty of Medicine, University of Thessaly, Larisa, Greece
4. Intermediate Care Unit, Cardiovascular Center, University Hospital of Bern, Bern, Switzerland
5. Department of Urology, Faculty of Medicine, University of Thessaly, Larisa, Greece
6. Outcomes Research Consortium, Cleveland, OH, USA