Affiliation: | 1. Department of Neurosurgery, Columbia University, College of Physicians and Surgeons, New York, NY, USA;2. Department of Radiology, Columbia University, College of Physicians and Surgeons, New York, NY, USA;3. Department of Neurology, Massachusetts General Hospital/Harvard Medical School, MGH-55 Fruit Street, Blake 12-Room 1291, Boston, MA 02114, USA |