[1] Univ Hosp, Dept Dermatol & Allergy, Bonn, Germany
[2] Christine Kuhne Ctr Allergy Res & Educ, Davos, Switzerland
[3] Univ Hosp, Dept Med Biometry Informat & Epidemiol, Bonn, Germany
[4] Univ Hosp Zurich, Dept Dermatol, Allergy Unit, Zurich, Switzerland
[5] Univ Augsburg, Fac Med, Environm Med, Augsburg, Germany
[6] Helmholtz Zentrum Muenchen, Helmholtz Zentrum Muenchen, Augsburg, Germany
[7] German Res Ctr Environm Hlth, Augsburg, Germany
[8] Hochgebirgsklin Davos, Davos, Switzerland
[9] Univ Zurich, Fac Med, Zurich, Switzerland
[10] Swiss Inst Allergy & Asthma Res, Davos, Switzerland
[11] Childrens Hosp Eastern Switzerland, St Gallen, Switzerland
[12] Davos Biosci, Davos, Switzerland