1. Department of Neurology, Boston Medical Center, Boston, Massachusetts
2. Department of Medicine, Boston Medical Center, Boston University School of Medicine, Boston, Massachusetts
3. Department of Cardiac and Thoracic Surgery, Boston Medical Center, Boston, Massachusetts
4. Department of Neurosurgery, Boston Medical Center, Boston University School of Medicine, Boston, Massachusetts
5. Department of Internal Medicine, Boston Medical center, Boston University School of Medicine, Boston, Massachusetts