1. Laboratory of Clinical Epidemiology, Department of Medical Epidemiology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Ranica, Bergamo, Italy.
2. Division of Biostatistics, College of Public Health, The Ohio State University, Columbus, Ohio, USA.
3. Neurointensive Care Unit, Grande Ospedale Metropolitano Niguarda, Milan, Italy.
4. Hungarian Army Medical Center, Budapest, Hungary.
5. Anesthesia, Intensive Care and Prehospital Emergency, Maggiore Hospital, Bologna, Italy.
6. Clinical Department of Anaesthesiology and Intensive Therapy, University Medical Centre Ljubljana, Ljubljana, Slovenia.
7. Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia.
8. General Hospital Novo Mesto, Novo Mesto, Slovenia.
9. University of Nicosia Medical School, Nicosia, Cyprus.
10. University Hospitals Bristol and Weston NHS Foundation Trust, Bristol, UK.
11. Pediatric Intensive Care Unit, Soroka Medical Center and The Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel.
12. Clinic of Anaesthesia and Intensive Care, Medical University of Warsaw, Warsaw, Poland.
13. Hospital Nursing Management, AUSL Romagna, Maurizio Bufalini Hospital, Cesena, Italy.
14. University Hospital of Heraklion, Crete, Greece.