[1] Univ Basel, Univ Hosp Basel, Dept Neurol, Basel, Switzerland
[2] Univ Basel, Univ Hosp Basel, Med Image Anal Ctr, Basel, Switzerland
[3] Univ Hamburg, Inst Syst Neurosci, Hamburg, Germany
[4] Tech Univ Muenchen, Dept Neurol, Munich, Germany
[5] Univ Calif San Francisco, Dept Neurol, Headache Grp, San Francisco, CA 94143 USA
[6] Kings Coll London, NIHR Wellcome Trust Kings Clin Res Facil, London, England
[7] Univ Bern, Bern Univ Hosp, Dept Neurol, Inselspital, Bern, Switzerland
[8] Univ Copenhagen, Danish Headache Ctr, Copenhagen, Denmark
[9] Univ Copenhagen, Dept Neurol, Copenhagen, Denmark
[10] Douglas Mental Hlth Univ Inst Montreal, Cerebral Imaging Ctr, Montreal, PQ, Canada
[11] McGill Univ, Dept Psychiat & Biol & Biomed Engn, Montreal, PQ, Canada
[12] DKD HELIOS Klin Wiesbaden, Dept Neurol, Aukammallee 33, D-65191 Wiesbaden, Germany