1. Department of Otorhinolaryngology Head and Neck Surgery Section of Rhinology and Allergy University Hospital Marburg Philipps‐Universität Marburg Marburg Germany
2. Department of Paediatrics Children's Center Bethel University Bielefeld Bielefeld Germany
3. Center for Rhinology and Allergology Wiesbaden Germany
4. Department of Pulmonary Medicine University Medicine Essen ‐ Ruhrlandklinik Essen Germany
5. Department of Pediatric Pulmonology and Allergy University Hospital Carl Gustav Carus Technical University of Dresden Dresden Germany
6. Department of Otorhinolaryngology (HNO‐Klinik) Düsseldorf University Hospital (UKD) Düsseldorf Germany
7. Department of Dermatoloy and Allergy Medizinische Hochschule Hannover Hannover Germany
8. Division of Allergology and Immunology, Department Dermatology Venerology and Allergology Charité Universitätsmedizin Berlin Berlin Germany