[1] Rigshosp, Danish Headache Ctr, Dept Neurol, Glostrup, Denmark
[2] Aarhus Univ Hosp, Dept Clin Immunol, Aarhus, Denmark
[3] Rigshosp, Dept Clin Immunol, Copenhagen, Denmark
[4] Odense Univ Hosp, Dept Clin Immunol, Odense, Denmark
[5] Statens Serum Inst, Dept Epidemiol Res, Copenhagen, Denmark
[6] Univ Copenhagen, Novo Nordisk Fdn, Ctr Prot Res, Copenhagen, Denmark
[7] Aalborg Univ Hosp, Dept Clin Immunol, Aalborg, Denmark
[8] Naestved Hosp, Dept Clin Immunol, Naestved, Denmark