1. Upper Airways Research Laboratory; Department Otorhinolaryngology; Ghent University Hospital; Ghent Belgium
2. Unidad de Gestión Clínica Allergy-IBIMA; University Hospital; Málaga Spain
3. Laboratory for Translational Research in Obstructive Pulmonary diseases; Department of Respiratory Medicine; Ghent University Hospital; Ghent Belgium
4. Division of ENT Diseases; Clintec, Karolinska Institutet; Stockholm Sweden
5. Clinical Division of ENT, Head & Neck Surgery; Laboratory of Clinical Immunology; University Hospitals Leuven; Leuven Belgium
6. Department of Otorhinolaryngology; Academic Medical Center; Amsterdam the Netherlands