1. Department of Anesthesiology, Critical Care and Pain Medicine, Neuroanaesthesia and Neurocritical care, University of Rome “La Sapienza”, Rome, Italy
2. Department of Neurosciences Psychiatric and Anesthesiological Sciences, University of Messina, Policlinico Universitario “G.Martino”, Messina, Italy
3. Department of Surgical and Anesthesiological Sciences, University of Bologna. Bologna, Italy