1 Neurosurgery-Neurotraumatology Unit, A.O.U. Parma and A.S.M.N. Reggio Emilia, Parma and Reggio Emilia, Italy. Electronic address: fservadei@ao.pr.it.
2 Intensive Care Unit, A.O.U. Parma, Parma, Italy.
3 Neurosurgery-Neurotraumatology Unit, A.O.U. Parma and A.S.M.N. Reggio Emilia, Parma and Reggio Emilia, Italy.