1 Departments of Radiology and Neurological Surgery and Neurological Institute, New York-Presbyterian University Hospital of Columbia and Cornell, Columbia University College of Physicians and Surgeons, 710 W. 168th St., Room 428, New York, NY 10032.
2 Departments of Radiology and Neurological Surgery and Neurological Institute, New York-Presbyterian University Hospital of Columbia and Cornell, Columbia University College of Physicians and Surgeons, 710 W. 168th St., Room 428, New York, NY 10032.. Electronic address: [email protected].