[1] Sahlgrens Univ Hosp, Dept Resp Med & Allergol, Sect Allergol, Gothenburg, Sweden
[2] Univ Gothenburg, Sahlgrenska Acad, Dept Rheumatol & Inflammat Res, Gothenburg, Sweden
[3] Sahlgrens Univ Hosp, Dept Internal Med, Gastroenterol Sect, Gothenburg, Sweden
[4] Karolinska Univ Hosp Solna, Dept Med Clin Immunol & Allergy Unit, Stockholm, Sweden
[5] Karolinska Inst, Natl Inst Enviromental Med Expt Asthma & Allergy, Stockholm, Sweden