1. Department of Anesthesia and Intensive Care I; Ospedale San Gerardo di Monza; Monza Italy
2. Deparment of Experimental Medicine; University of Milano-Bicocca; Monza Italy
3. Department of Anaesthesia; Intensive Care and Pain Medicine; Policlinico Universitario A. Gemelli; Rome Italy
4. Department of Neuroanaesthesia and Intensive Care; Istituto Neurologico Carlo Besta; Milan Italy
5. Department of Anaesthesiology; Intensive Care Medicine and Emergency Medicine; Klinikum Frankfurt Hoechst; Teaching Hospital of the J.W. Goethe-University; Frankfurt Germany
6. Department of Pediatric Anesthesia and Intensive Care; Istituto Gianna Gaslini; Genoa Italy
7. Department of Anesthesia and Intensive Care; Azienda Ospedaliero-Universitario Policlinico Vittorio Emanuele Catania; Catania Italy
8. Department of Anesthesia; Azienda Ospedaliera di Padova; Padova Italy
9. Department of Anesthesia and Intensive Care; Ospedale Pediatrico Meyer; Florence Italy
10. Department of Anesthesia and Intensive Care; Ospedale Pedriatrico Bambino Gesù; Rome Italy
11. Department of Anesthesia and Intensive care; Ospedali Riuniti di Bergamo; Bergamo Italy
12. Department of Maxillofacial surgery; Ospedale San Gerardo; Monza Italy
13. Department of Neurosurgery; University of Milano-Bicocca; Ospedale San Gerardo; Monza Italy
14. Department of Epidemiology; IRCCS - Istituto di Ricerche Farmacologiche “Mario Negri”; Milan Italy
15. Department of Health Science; Centre of Biostatistics for Clinical Epidemiology; University of Milano-Bicocca; Monza Italy
16. Alan Edwards Centre for Research on Pain; McGill University; Montreal QC Canada
17. Department of Anesthesia; Mc Gill University Health Centre; Montreal Childrens Hospital; Montreal QC Canada