[1] Copenhagen Univ Hosp, Dept Dermatoallergol, Natl Allergy Res Ctr, Gentofte, Denmark
[2] Res Ctr Prevent & Hlth, Copenhagen, Denmark
[3] Copenhagen Univ Hosp, Dept Clin Biochem, Gentofte, Denmark
[4] Glostrup Univ Hosp, Dept Clin Expt Res, Glostrup, Denmark
[5] Univ Copenhagen, Fac Hlth & Med Sci, Dept Clin Med, Copenhagen, Denmark