1. Center for Rhinology and Allergology; Wiesbaden Germany
2. Department of Otorhinolaryngology; Head and Neck Surgery; Universitätsmedizin Mannheim; Medical Faculty Mannheim; Heidelberg University; Mannheim Germany
3. HAL Allergy BV; Leiden The Netherlands
4. Experimental Immunology; Academic Medical Center; Amsterdam The Netherlands
5. Department of Otorhino-laryngology; Academic Medical Center; Amsterdam The Netherlands
6. Unitat d'Allèrgia; Hospital Universitari Germans Trias i Pujol; Badalona Spain
7. Department of Otorhinolaryngology - Head & Neck Surgery; Medical University of Innsbruck; Innsbruck Austria
8. Department of Allergology; University Medical Center Groningen; University of Groningen; Groningen The Netherlands
9. Department of Respiratory Medicine & Allergology; Institute for Clinical Science; Skane University Hospital; Lund Sweden
10. Department of Clinical Pharmacy & Pharmacology and Department of Gen Practice; University Medical Center Groningen; University Groningen; Groningen The Netherlands
11. Upper Airways Research Laboratory; Ghent University; Ghent Belgium