[1] Univ Copenhagen, Rigshosp, Danish Headache Ctr, Copenhagen, Denmark
[2] CHU Nice, Pain Dept & FHU InovPain, Nice, France
[3] Univ Cote Azur, Nice, France
[4] Vall dHebron Univ Hosp, Barcelona, Spain
[5] Autonomous Univ Barcelona, Barcelona, Spain
[6] Lundbeck, Copenhagen, Denmark