1. Department of Neurosurgery, St. Elizabeth's Hospital, Boston, Massachusetts
2. Tufts University School of Medicine; Department of Neurosurgery, St. Elizabeth's Hospital, Boston, Massachusetts
3. Department of Neurology, Neurology, St. Elizabeth's Hospital, Boston, Massachusetts
4. Tufts New England Medical Center; and Departments of Neurosurgery, St. Elizabeth's Hospital, Boston, Massachusetts