1. Allergy Center; University Hospital; Linköping Sweden
2. Department of Dermatology and Allergy Biederstein; Technical University Munich; Munich Germany
3. Sachs′ Children and Youth Hospital and Karolinska Institutet, Södersjukhuset; Stockholm Sweden
4. Allergy Section; Department of Internal Medicine; Hospital Universitari Vall d'Hebron; Barcelona Spain
5. Division of Paediatrics; University of Geneva; Genève Switzerland
6. CHP; Porto Portugal
7. Unit of Autoimmunity and Immune Regulation; Department of Clinical and Experimental Medicine; Linköping University; Linköping Sweden
8. Pediatric Pneumology and Immunology; Charité Universitätsmedizin; Berlin Germany
9. Department of Occupational and Environmental Dermatology; Lund University; Malmö Sweden
10. The Public Health Agency of Sweden; Stockholm Sweden
11. Child Life & Health and MRC-Centre for Inflammation Research; The University of Edinburgh; Edinburgh UK
12. Asthma UK Centre for Applied Research; Usher Institute of Population Health Sciences and Informatics; The University of Edinburgh; Edinburgh UK
13. Norwegian Institute of Public Health; Oslo Norway
14. Institute of Laboratory Medicine and Pathobiochemistry; Molecular Diagnostics; Philipps University Marburg; University Hospital Giessen and Marburg GmbH; Marburg Germany
15. Department of ENT; AMC; Amsterdam the Netherlands
16. Immunology Unit; University Hospital; Verona Italy