1. Institute for Medical Informatics, Biometry and Epidemiology Medical Faculty of the University of Duisburg‐Essen Essen Germany
2. Jefferson Headache Center Thomas Jefferson University Hospitals Philadelphia PA USA
3. Department of Neurology Geisel School of Medicine at Dartmouth Hanover NH USA
4. Department of Neurology and Neurological Sciences Stanford University Headache and Facial Pain Program Palo Alto CA USA
5. Department of Neurology Mayo Clinic Scottsdale AZ USA
6. Diamond Headache Clinic Chicago IL USA
7. Pacific Northwest Statistical Consulting, Inc. Woodinville WA USA
8. Lundbeck Seattle BioPharmaceuticals, Inc. Bothell WA USA
9. H. Lundbeck A/S Copenhagen Denmark