1 Department of Neurosurgery, University Hospital of Modena - "NOCSAE" Hospital of Baggiovara, Modena, Italy. Electronic address: a.valluzzi@email.it.
2 Department of Neurologic Surgery, Mayo Clinic, Rochester, Minn.
3 Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Azienda Ospedaliero-Universitaria di Bologna, Istituto di Ematologia Seragnoli, Bologna, Italy.
4 Department of Neurosurgery, University Hospital of Modena - "NOCSAE" Hospital of Baggiovara, Modena, Italy.
5 Department of Neurosurgery, IRCCS Istituto Delle Scienze Neurologiche di Bologna, Emilia-Romagna, Italy.