1 Örebro University, 6233, Department of Neurosurgery, Orebro Universitet, Orebro, Sweden.
2 Academic Neurosurgery, Department of Neuroscience, University of Padova, Padua, Italy.
3 Neurosurgery Unit, Department of Biomedical and Dental Sciences and Morpho-Functional Imaging, University of Messina, Messina, Italy. germano@unime.it.