1. Montefiore Headache Center; Bronx NY USA
2. Albert Einstein College of Medicine; Bronx NY USA
3. Vedanta Research; Chapel Hill NC USA
4. University of Cincinnati Headache and Facial Pain Center, University of Cincinnati College of Medicine; Cincinnati OH USA
5. Allergan plc; Irvine CA USA
6. NIHR-Wellcome Trust King's Clinical Research Facility, King's College London; London UK
7. Department of Neurology; University of California, San Francisco; San Francisco CA USA