1. Danish Headache Center, Department of Neurology, Rigshospitalet Glostrup, Faculty of Health and Medical Sciences University of Copenhagen Copenhagen Denmark
2. Lilly Corporate Center Eli Lilly and Company Indianapolis IN USA
3. Covance Chiltern Princeton NJ USA
4. Eli Lilly Canada Inc Toronto ON Canada
5. Headache Science Centre IRCCS C. Mondino Foundation Pavia Italy
6. Department of Brain and Behavioral Sciences University of Pavia Pavia Italy