[1] Karolinska Inst, Ctr Allergy Res, Stockholm, Sweden
[2] Karolinska Inst, Dept Med Epidemiol & Biostat, Stockholm, Sweden
[3] Karolinska Inst, Inst Environm Med, S-10401 Stockholm, Sweden
[4] Umea Univ, Dept Publ Hlth & Clin Med, Umea, Sweden
[5] Swedish Council Hlth Technol Assessment, SBU, Stockholm, Sweden
[6] Karolinska Inst, Dept Learning Informat Management & Eth, Stockholm, Sweden
[7] Karolinska Inst, Med Management Ctr, Stockholm, Sweden
[8] Sahlgrens Univ Hosp, Allergy Unit, Gothenburg, Sweden
[9] Swedish Asthma & Allergy Fdn, Stockholm, Sweden
[10] Linnaeus Univ, Dept Hlth & Caring Sci, Kalmar, Sweden
[11] Sachs Children & Youth Hosp, Stockholm, Sweden
[12] Karolinska Inst, Dept Clin Res & Educ Sodersjukhuset, Stockholm, Sweden