1. Department of Neurosurgery, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts;
2. Department of Medicine and Surgery, Neurosurgery, University of Milano-Bicocca, Milan, Italy;
3. Department of Neurosurgery, Haaglanden Medical Center, The Hague, The Netherlands;
4. Harvard Medical School, Boston, Massachusetts;
5. Department of Surgical Sciences, Unit of Neurosurgery, Santa Maria Goretti Hospital, Latina, Italy;
6. Head and Neck Department, Neurosurgery Unit, Foundation IRCCS Policlinico San Matteo, Pavia, Italy; and
7. Department of Neurosurgery, Foundation IRCCS San Gerardo dei Tintori, Monza, Italy