[1] Univ Napoli Federico II, Div Neurosurg, Naples, Italy
[2] Santa Maria Misericordia Univ Hosp, Neurosurg Unit, Dept Neurosci, Udine, Italy
[3] Policlin G Rodol Univ Hosp, Dept Neurosurg, Catania, Italy
[4] Sondrio ASST Valtellina & Alto Lario, Neurosurg Unit, Sondrio, Italy
[5] IRCCS Neuromed, Dept Neurosurg, Pozzilli, IS, Italy
[6] ASST Niguarda Hosp, Dept Neurosurg, Milan, Italy