1. Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland
2. Paediatric Respiratory Medicine, Children’s University Hospital of Bern, University of Bern, Bern, Switzerland
3. Assistance Publique-Hôpitaux de Paris (AP-HP), Université Paris-Saclay, Hôpital Bicêtre, Service d’ORL, Le Kremlin-Bicêtre, France
4. Faculté de Médecine, Université Paris-Saclay, Le Kremlin-Bicêtre, France
5. Department of Otorhinolaryngology, Nicosia General Hospital, Nicosia, Cyprus
6. Department of Otorhinolaryngology and Primary Ciliary Dyskinesia Unit, La Fe University and Polytechnic Hospital, Valencia, Spain
7. University of Valencia Medical School, Valencia, Spain
8. Department of Paediatrics, University Hospital, Leuven, Belgium
9. Primary Ciliary Dyskinesia Centre, Southampton Children’s Hospital, Southampton NHS Foundation Trust, Southampton, England, United Kingdom
10. Department of Otorhinolaryngology–Head and Neck Surgery, University Hospital of Bern, University of Bern, Bern, Switzerland
11. Paediatric Department of Allergy and Lung Diseases, Oslo University Hospital, Oslo, Norway
12. Department of Otorhinolaryngology–Head and Neck Surgery, Oslo University Hospital, Oslo, Norway
13. Faculty of Medicine, University of Oslo, Oslo, Norway
14. Department of Pediatric Pulmonology, Hacettepe University School of Medicine, Ankara, Turkey
15. Department of Pediatric Pulmonology, Marmara University School of Medicine, Istanbul, Turkey
16. Department of Otorhinolaryngology–Head and Neck Surgery, Amsterdam UMC, Amsterdam, the Netherlands
17. Department of Otorhinolaryngology, Hacettepe University School of Medicine, Ankara, Turkey
18. Department of Pediatric Pulmonology, Emma Children’s Hospital, Amsterdam UMC, Vrije Universiteit, Amsterdam, the Netherlands
19. Primary Ciliary Dyskinesia Centre, NIHR Respiratory Biomedical Research Centre, University of Southampton, Southampton, England, United Kingdom
20. Department of Otorhinolaryngology–Head and Neck Surgery, Charité-Universitätsmedizin Berlin, Berlin, Germany
21. Division of Respirology, Department of Pediatrics, University Hospital Liège, Liège, Belgium
22. Department of Respiratory Diseases, University Hospital, Leuven, Belgium
23. Department of Pediatric Pulmonology, Immunology and Critical Care Medicine, Charité-Universitätsmedizin Berlin, Berlin, Germany
24. Department of Otorhinolaryngology, University Hospital Liège, Liège, Belgium
25. Biomedical Sciences Department, CEU-Cardenal Herrera University, Castellón, Spain
26. Molecular, Cellular and Genomic Biomedicine Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain
27. University of Cyprus Medical School, Nicosia, Cyprus
28. Pediatric Pulmonology Unit, Archbishop Makarios III Hospital, Nicosia, Cyprus
29. Department of Otolaryngology, Marmara University School of Medicine, Istanbul, Turkey