1. Immune Tolerance Group, Allergy and Clinical Immunology, Inflammation, Repair and Development, NHLI, Imperial College, London, MRC Asthma UK Centre, UK
2. Division of Allergy and Immunology, University of South Florida Morsani College of Medicine, Tampa, Florida, USA
3. Vienna Challenge Chamber, Vienna, Austria; Allergy Center Vienna West, Vienna, Austria; Thermo Fisher Diagnostics Austria, Vienna, Austria
4. ENT Clinical Department, University Hospital Ghent, Ghent, Belgium; Upper Airways Research Laboratory, University of Ghent, Ghent, Belgium
5. Division of Allergy, Department of Pulmonology, Hôpital Arnaud de Villeneuve, University Hospital of Montpellier, Montpellier, France