[1] Kings Coll London, Headache Grp, NIHR Kings Clin Res, London, England
[2] Univ Calif Los Angeles, Dept Neurol, Los Angeles, CA USA
[3] Univ Munster, Fac Medine, Munster, Germany
[4] Univ Calif San Francisco, Dept Neurol, San Francisco, CA USA
[5] Albert Einstein Coll Med, Bronx, NY USA
[6] Univ Hamburg, Hamburg, Germany
[7] Vall Hebron Univ Hosp, Barcelona, Spain
[8] Univ Liege, Headache Res, Liege, Belgium
[9] Mayo Clin, Dept Neurol, Phoenix, AZ USA
[10] Univ Pavia, Dept Brain & Behav Sci, Pavia, Italy
[11] IRCCS Mondino Fdn, Headache Sci Ctr, Pavia, Italy
[12] Leiden Univ, Med Ctr, Dept Neurol, Leiden, Netherlands
[13] Taipei Vet Gen Hosp, Dept Neurol, Taipei, Taiwan
[14] Natl Yang Ming Chiao Tung Univ, Coll Med, Taipei, Taiwan
[15] Kings Coll Hosp London, Wellcome Fdn Bldg, London SE5 9PJ, England