[1] Fdn IRCCS Policlin San Matteo, Dept Neurosurg, Viale Golgi 19, I-27100 Pavia, Italy
[2] Univ Messina, BIOMORF Dept, Div Neurosurg, Messina, Italy
[3] Univ Napoli Federico II, Dept Neurosci & Reprod & Odontostomatol Sci, Div Neurosurg, Naples, Italy
[4] Catholic Univ, Fdn Policlin Univ A Gemelli IRCCS, Inst Neurosurg, Rome, Italy
[5] Mater Olbia Hosp, Dept Neurosurg, Olbia, Italy
[6] IRCCS Inst Neurol Sci Bologna, Dept Neurosurg, Bologna, Italy
[7] Univ Bologna, Dept Biomed & Neuromotor Sci, Bologna, Italy
[8] ASST Fatebenefratelli Sacco, Dept Neurosurg, Milan, Italy
[9] Univ Brescia, Dept Surg Specialties Radiol Sci & Publ Hlth, Div Neurosurg, Brescia, Italy