1. 1Department of Neurosurgery, National Cancer Institute IFO—Regina Elena, Roma;
2. 4Department of Neurosurgery, Treviso Hospital, Padova University, Treviso;
3. 2Department of Neurosurgery, Livorno Hospital, Livorno;
4. 3Department of Neurosurgery, Reggio Calabria Hospital, Reggio Calabria;
5. 5Department of Neurosurgery, Federico II University School of Medicine, Naples;
6. 6Department of Neurosurgery, Bellaria Hospital, Bologna; and
7. 7Department of Neurosurgery, Padua University Hospital, Padova, Italy