1. Department of Biotechnological and Applied Clinical Sciences, Intensive Care, and Pain Treatment, University of L'Aquila, L'Aquila, Italy.
2. Department of Anesthesia and Intensive Care Unit, Mazzini Hospital, Teramo, Italy.
3. Department of Life, Health and Environmental Sciences, Intensive Care, and Pain Treatment, University of L'Aquila, L'Aquila, Italy.
4. Neurology Unit, Mazzini Hospital, Teramo, Italy.
5. Department of Neurosurgery, San Salvatore Hospital, L'Aquila, Italy.
6. Department of Anesthesiology, Intensive Care, and Pain Treatment, University of L'Aquila, L'Aquila, Italy.
7. Department of Neurology, San Salvatore Hospital, L'Aquila, Italy.