1. Department of Anesthesia, Critical Care and Pain Medicine Beth Israel Deaconess Medical Center Boston MA USA
2. Harvard Medical School Boston MA USA
3. The Headache Center of Southern California The Neurology Center Carlsbad CA USA
4. Department of Neurology Jefferson Headache Center Thomas Jefferson University Philadelphia PA USA
5. Allergan, Inc. Irvine CA USA
6. University of California Irvine CA USA