1. Department of Dermatology and Allergy University Hospital Rheinische Friedrich‐Wilhelms University of Bonn Bonn Germany
2. Christine Kühne‐Center for Allergy Research and Education (Davos) Davos Switzerland
3. Chair and Institute of Environmental Medicine UNIKA‐T Technical University of Munich and Helmholtz Zentrum München Augsburg Germany
4. Children's Hospital of Eastern Switzerland St. Gallen Switzerland
5. Swiss Institute of Allergy and Asthma Research (SIAF) University of Zurich Zurich Switzerland
6. Allergy Unit Department of Dermatology University Hospital of Zürich Zürich Switzerland