1. Institute of Neurosurgery, Ospedale Molinette, University of Turin, Turin, Italy
2. Service of Nuclear Medicine, Ospedale Molinette, University of Turin, Turin, Italy
3. Service of Neuroanesthesiology, Ospedale Molinette, University of Turin, Turin, Italy
4. Department of Neuroradiology, Ospedale Molinette, University of Turin, Turin, Italy