[1] Humanitas Clin & Res Ctr IRCCS, Dept Neurosurg, Milan, Italy
[2] Humanitas Univ, Dept Biomed Sceinces, Milan, Italy
[3] IRCCS NEUROMED, Dept Neurosurg, Pozzilli, Isernia, Italy
[4] Osped Angelo, Dept Neurosurg, Venice, Italy
[5] San Giovanni Addolorata Hosp, Dept Neurosurg, Rome, Italy
[6] Univ Catania, Dept Neurosurg, Catania, Italy
[7] ASL Napoli 2 Nord, Santa Maria delle Grazie Hosp, Naples, Italy
[8] ASST Fatebenefratelli Sacco, Dept Neurosurg, Milan, Italy
[9] Santa Maria della Misericordia Univ Hosp, Sect Spinal Column & Spinal Cord Surg, Udine, Italy
[10] Santa Maria della Misericordia Univ Hosp, Spinal Unit, Udine, Italy
[11] Sapienza Univ, Fac Med & Psychol, NESMOS Dept, Rome, Italy
[12] Marche Polytech Univ, Dept Neurosurg, Ancona, Italy
[13] Sapienza Univ, Dept Neurol & Psychiat, Neurosurg, Polo Pontino, Rome, Italy
[14] Ctr Chirurg Toscano, Spinal Sect, Arezzo, Italy
[15] Univ Naples Federico II, Div Neurosurg, Naples, Italy
[16] San Carlo di Nancy Hosp, Div Neurosurg & Spinal Surg, Rome, Italy
[17] Sapienza Univ, Umberto I Univ Hosp, Neurosurg Div, Rome, Italy
[18] Univ Cattolica Sacro Cuore, Inst Neurosurg, Rome, Italy
[19] San Giovanni Bosco Hosp, Unit Neurosurg, Naples, Italy
[20] Gen Hosp Cosenza, Unit Neurosurg, Cosenza, Italy
[21] SS Antonio e Biagio e Cesare Arrigo Hosp, Unit Neurosurg, Alessandria, Italy