1 *Neurosurgery Unit, Fondazione IRCCS Policlinico S. Matteo, Pavia, Italy ‡PhD Program in Experimental Medicine, Università degli Studi di Pavia, Pavia, Italy §Platelets Physiopathology Laboratory, Department of Internal Medicine ¶Interventional Neuroradiology Unit, Fondazione IRCCS Policlinico S. Matteo, Pavia, Italy.