1. Department of Neurology; University of Michigan; Ann Arbor MI USA
2. Neuro and Headache Center, SwedishAmerican Hospital; Rockford IL USA
3. Department of Neurology-Headache Division; University of Miami, Miller School of Medicine; Miami FL USA
4. Weill Cornell Medicine Headache Program, Department of Neurology; Weill Cornell Medical College; New York NY USA
5. Division of Neurology; Cincinnati Children's Medical Center, University of Cincinnati College of Medicine; Cincinnati OH USA
6. Herman Ostrow School of Dentistry; University of Southern California; Los Angeles CA USA
7. Department of Neurology, Albert Einstein College of Medicine; Montefiore Headache Center; Bronx NY USA