1. Department of Neurology Jefferson Headache Center Thomas Jefferson University Philadelphia Pennsylvania USA
2. Institute for Medical Informatics, Biometry and Epidemiology Medical Faculty University of Duisburg‐Essen Essen Germany
3. Department of Neurology and Neurological Sciences Stanford University Headache and Facial Pain Program Palo Alto California USA
4. Department of Neurology Geisel School of Medicine at Dartmouth Hanover New Hampshire USA
5. Diamond Headache Clinic Chicago Illinois USA
6. Department of Neurology Mayo Clinic Phoenix Arizona USA
7. Pacific Northwest Statistical Consulting, Inc. Woodinville Washington USA
8. Lundbeck Seattle BioPharmaceuticals, Inc. Bothell Washington USA
9. H. Lundbeck A/S Copenhagen Denmark
10. Lundbeck La Jolla Research Center San Diego California USA