1. Department of Neurosurgery, Stanford University School of Medicine, Stanford, CA 94305, USA.
2. Université Paris Cité, Paris 75006, France.
3. Assistance Publique des Hôpitaux de Paris, Paris 75012, France.
4. Department of Neurosurgery, Perelman School of Medicine, Richards Medical Research Laboratories, Pennsylvania Hospital, University of Pennsylvania, Philadelphia, PA 19104, USA.
5. Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA 94305, USA.
6. Department of Radiology, Stanford University School of Medicine, Stanford, CA, 94305 USA.
7. Department of Surgery, Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, PA 19104, USA.