[1] Univ Med Ctr Hamburg Eppendorf, Dept Syst Neurosci, Martinistr 52, D-20246 Hamburg, Germany
[2] Univ Wisconsin, Dept Orthoped & Rehabil, Madison, WI 53706 USA
[3] Univ Copenhagen, Dept Neurol, Danish Headache Ctr, Rigshosp, DK-2600 Glostrup, Denmark
[4] Vrije Univ Amsterdam Med Ctr, Dept Gen Practice & Elderly Care Med, EMGO Inst Hlth Care Res, Amsterdam, Netherlands
[5] Akershus Univ Hosp, Head & Neck Res Grp, Res Ctr, N-1478 Oslo, Norway
[6] Akershus Univ Hosp, Inst Clin Med, N-1474 Nordbyhagen, Norway
[7] Univ Oslo, N-1474 Nordbyhagen, Norway
[8] Univ Birmingham, Sch Sport Exercise & Rehabil Sci, Coll Life & Environm Sci, Birmingham, W Midlands, England
[9] Univ Hosp Gottingen, Ctr Anesthesiol Emergency & Intens Care Med, Pain Clin, Gottingen, Germany
[10] Univ Rey Juan Carlos, Dept Phys Therapy Occupat Therapy Rehabil & Phys, Madrid, Spain
[11] Curtin Univ, Sch Physiotherapy & Exercise Sci, POB U1987, Perth, WA 6845, Australia
[12] Physiotherapy Practice Jensen & Team, Marktpl 29, D-22609 Hamburg, Germany
[13] Birmingham Community Healthcare NHS Trust, Physiotherapy, Birmingham, W Midlands, England
[14] Univ Queensland, Physiotherapy, Sch Hlth & Rehabil Sci, Brisbane, Qld 4072, Australia
[15] Spine Ctr Am Michel, Ludwig Erhard Str 18, D-20459 Hamburg, Germany
[16] Univ Hosp Birmingham Fdn Trust, Physiotherapy Dept, Birmingham B15 2TH, W Midlands, England
[17] Migraine & Headache Clin Konigstein Taunus, Olmuhlweg 31, D-61462 Konigstein Im Taunus, Germany
[18] Hsch Angew Wissensch & Kunst Hildesheim Holzminde, Fak Soziale Arbeit & Gesundheit, Studiengang Ergotherapie Logopadie & Physiotherap, Goschentor 1, D-31134 Hildesheim, Germany
[19] Univ Appl Sci Osnabrueck, Fac Business Managment & Social Sci, Dept Movement & Rehabil Sci, Caprivistr 30a, D-49076 Osnabruck, Germany
[20] Watson Headache Inst, GPO Box 4714, Sydney, NSW 2001, Australia
[21] Heimlisbergstr 47, CH-4513 Langendorf, Switzerland