1. Departments of Neurological Surgery, Columbia-Presbyterian Medical Center, Columbia University College of Physicians and Surgeons, New York, New York
2. Cardiac Surgery, Columbia-Presbyterian Medical Center, Columbia University College of Physicians and Surgeons, New York, New York
3. Neurology, Columbia-Presbyterian Medical Center, Columbia University College of Physicians and Surgeons, New York, New York
4. Anesthesiology, Columbia-Presbyterian Medical Center, Columbia University College of Physicians and Surgeons, New York, New York