1. Department of Neurosurgery, IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy;
2. Dipartimento di Biomorfologia e. Scienze Neuromotorie (DIBINEM), Alma Mater Studiorum Università di Bologna, Bologna, Italy;
3. Neurosurgery Service and Gamma Knife Center, Lausanne University Hospital (CHUV), Lausanne, Switzerland;
4. Faculty of Biology and Medicine (FBM), University of Lausanne (UNIL), Lausanne, Switzerland;
5. Ecole Polytechnique Fédérale de Lausanne (EPFL, LTS-5), Lausanne, Switzerland