1. Divisione di Neurochirurgia per la Traumatologia
2. Ospedale Maurizio Bufalini, Cesena, Italy; Medical Statistics Unit
3. University of Edinburgh Medical School, Edinburgh, Scotland; University
4. Department of Anaesthetics Leeds General Infirmary, Leeds, England
5. Department of Clinical Neurosciences Southampton General Hospital, Southampton, England; Centre Hospitalier Universitaire de Poitiers
6. Department of Neurosurgery Institute of Neurological Sciences, Southern General Hospital, Glasgow, Scotland
7. Service de Neurochirurgie, Poitiers, France
8. Department of Neurosurgery University Hospital Rotterdam, Rotterdam, The Netherlands; Neurochirurgische Klinik Universität Köln, Köln, Germany
9. Department of Neurosurgery Helsinki University Central Hospital, Helsinki, Finland
10. Department of Neurosurgery Akademiska Hospital, Uppsala, Sweden; Terapia Intensiva Neurochirurgica Servizio Anestesia e Rianimazione
11. Ospedale Maggiore Policlinico, Istituto di Ricovero e Cura a Carettere Scientifico Milano, Milano, Italy
12. Department of Neurosurgery University Medical School, Lublin, Poland
13. Department of Neurosurgery Virchow-Klinikum, Medizinische Fakultät, Humboldt Universität Berlin, Berlin, Germany