1. Department of Neurology, Albert Einstein College of Medicine and the Montefiore Headache Center, Bronx, New York
2. Headache Unit, Neurology Department, Vall d’Hebron University Hospital, Barcelona, Spain
3. Headache Research Group, Vall d'Hebron Institute of Research, Universitat Autonoma of Barcelona, Barcelona, Spain
4. The San Diego Headache Center and The Los Angeles Headache Center, Carlsbad, California
5. Department of Neurology, Mayo Clinic, Scottsdale, Arizona
6. New England Institute for Neurology and Headache, Stamford, Connecticut
7. AbbVie, Madison, New Jersey