1. Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
2. Tufts University School of Dental Medicine, Boston, Massachusetts
3. McLean Hospital, Harvard Medical School, Boston, Massachusetts
4. Boston University School of Medicine, Boston, Massachusetts
5. Boston PainCare Center, Boston, Massachusetts
6. Craniofacial Pain and Headache Center, Tufts University, Boston, Massachusetts
7. Moriarty, Shay and Associates, Wakefield, Massachusetts, USA