1. Department of Neurosurgery, “Riuniti” Hospital, Foggia, Puglia, Italy.
2. Neurosurgical Unit, Miulli Hospital, Acquaviva delle Fonti, Puglia, Italy.
3. Department of Neurosurgery, “Rummo” Hospital, Benevento, Campania, Italy.
4. Department of Neurosurgery, University of Foggia, Foggia, Puglia, Italy.