1. Mayo Clinic, Scottsdale, AZ.
2. AbbVie, Irvine, CA.
3. Barrow Neurological Institute, Phoenix, AZ.
4. DENT Neurologic Institute, Amherst, NY.
5. Genesis Research LLC, Hoboken, NJ.
6. AbbVie, Madison, NJ.
7. The Los Angeles Headache Center, CA.
8. The San Diego Headache Center, CA.