[1] Magna Graecia Univ Catanzaro, Dept Clin & Expt Med, Div Neurosurg, Catanzaro, Italy
[2] St Johns Hlth Ctr, John Wayne Canc Inst, Div Neurosurg, Santa Monica, CA USA
[3] Univ Montreal, Hop Notre Dame, Ctr Hosp, Dept Surg,Div Neurosurg, Montreal, PQ, Canada