1. UCSF Headache Center; San Francisco CA USA
2. Jefferson Headache Center; Philadelphia PA USA
3. Peachtree Neurological Clinic; Atlanta GA USA
4. University of Washington School of Medicine; Seattle WA USA
5. Eli Lilly and Company; Indianapolis IN USA
6. FORCE Communications; Indianapolis IN USA
7. Swedish Neurology Issaquah; Sammamish WA USA
8. KentuckyOne Health® Neurology Associates; Lexington KY USA