1. Montefiore Headache Center; Department of Neurology; Albert Einstein College of Medicine; Bronx NY USA
2. Neurology; The Headache Center of Southern California; Encinitas CA USA
3. University of Michigan Health System; Ann Arbor MI USA
4. Tufts University School of Medicine; Springfield MA USA
5. Springfield Neurology Associates; Springfield MA USA
6. Department of Neurology; Mayo Clinic; Rochester MN USA
7. North Texas Center for Head, Face & TMJ Pain; Dallas TX USA
8. Texas A&M University Baylor College of Dentistry; Dallas TX USA
9. Headache Clinic; Middletown Medical; Middletown NY USA
10. Doylestown Hospital; Doylestown PA USA