1. Department of Neurosurgery, S Anna University Hospital, via Aldo Moro, 8, 44124 Cona, Ferrara, Italy
2. Department of Neurosurgery, Catholic University School of Medicine, Largo Francesco Vito, 1, 00168, Rome, Italy.
3. Department of Neurosurgery, Catholic University School of Medicine, Largo Francesco Vito, 1, 00168, Rome, Italy