1. Yale Neurology, New Haven, CT, USA
2. The CHOICE Institute, School of Pharmacy, University of Washington, Seattle, WA, USA
3. Headache Center of Southern California, The Neurology Center, Carlsbad, CA, USA
4. Chicago Headache Center and Research Institute, Chicago, IL, USA
5. Jefferson Headache Center, Department of Neurology, Thomas Jefferson University, Philadelphia, PA, USA
6. Department of Neurology, Albert Einstein College of Medicine, Bronx, NY, USA
7. World Health Education Foundation, Irvine, CA, USA
8. American Migraine Foundation, Mount Royal, NJ, USA