1. Mayo Clinic, Phoenix, AZ, USA
2. AbbVie, Irvine, CA, USA
3. Albert Einstein College of Medicine, Bronx, NY, USA
4. Montefiore Headache Center, Bronx, NY, USA
5. Preventive Cardiology, Boca Raton, FL, USA
6. University of Pennsylvania, Philadelphia, PA, USA
7. Jefferson Headache Center, Philadelphia, PA, USA
8. Preferred Healthcare Partners, Pittsburgh, PA, USA
9. NYU Langone Medical Center, New York, NY, USA