1. Dipartimento di Morfologia, Azienda Ospedaliera Sant'Anna, UOC di Neurochirurgia, Chirurgia e Medicina Sperimentale, Università di Ferrara, Ferrara, Italy
2. Department of Neurosurgery, University of Ferrara, Ferrara, Emilia-Romagna, Italy
3. Department of Vascular Surgery, University of Ferrara, Ferrara, Emilia-Romagna, Italy
4. Neurosurgery Department of Medical and Surgical Specialties, Radiological Sciences and Public Health University of Brescia, Brescia, Italy
5. Department of Neurosurgery, Ospedale Niguarda Ca Granda, Milano, Lombardia, Italy
6. Department of Neurosurgery, Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy
7. Department of Neurosurgery, University of Brescia, Brescia, Lombardia, Italy