1. Department of Neurology Brigham and Women’s Hospital Boston MA USA
2. Department of Neurology Harvard Vanguard Medical Associates Braintree MA USA
3. Division of Neurology Cambridge Health Alliance Cambridge MA USA
4. Harvard Medical School Boston MA USA
5. Abington Headache Center Abington Memorial Hospital Abington PA USA
6. Abington Neurological Associates, Ltd Willow Grove PA USA