1. Department of Pediatrics and Adolescent Medicine Turku University Hospital and University of Turku Turku Finland
2. Allergy Department 2nd Pediatric Clinic National and Kapodistrian University of Athens Athens Greece
3. Department of Biostatistics University of Turku Turku Finland
4. Upper Airway Research Laboratory Ghent University Hospital Ghent Belgium
5. Department of Molecular Pneumology Friedrich‐Alexander‐Universität Erlangen‐Nürnberg Universitätsklinikum Erlangen Erlangen Germany
6. Department of Immunology, Rheumatology and Allergy Central University Hospital Lodz Poland
7. Department of Clinical Microbiology Turku University Hospital and Institute of Biomedicine University of Turku Turku Finland
8. Department of Pediatrics and Adolescent Medicine Department of Allergy and Pneumology Children's Hospital Friedrich‐Alexander‐Universität Erlangen‐Nürnberg Universitätsklinikum Erlangen Erlangen Germany
9. Division of Infection, Immunity & Respiratory Medicine University of Manchester Manchester UK