1. Department of Translational Research and New Technologies in Medicine and Surgery, EndoCAS Center, University of Pisa, Pisa, Italy;
2. Department of Information Engineering, University of Pisa, Pisa, Italy
3. Department of Neurosurgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA;
4. Department of Neurological Surgery, University of Pisa, Pisa, Italy;
5. Department of Vascular Surgery, Pisa University Medical School, Pisa, Italy;