1. Medical Statistics Team, Institute of Applied Health SciencesUniversity of Aberdeen UK
2. Department of Paediatric Respiratory Medicine and AllergologyErasmus MC Sophia Children's HospitalRotterdam Netherlands
3. Clinical and Experimental Science Academic UnitUniversity of SouthamptonSouthampton UK
4. Respiratory Critical Care and Anaesthesia group, Institute of Child HealthUniversity College London UK
5. Department of Respiratory and Sleep Medicine, Queensland's Children's HospitalQueensland University of TechnologyBrisbane Australia
6. Child Health Division, Menzies School of Health ResearchCharles Darwin UniversityDarwin Australia
7. University Children's HospitalVienna Austria
8. Department of Pediatrics, Breathing Institute, Children's Hospital ColoradoUniversity of Colorado School of MedicineAurora Colorado
9. National Institute of Allergy and Infectious DiseasesBethesda Maryland
10. Department of PaediatricsHôpital Erasme, Université Libre de Bruxelles (ULB)Brussels Belgium
11. Department of PaediatricsAntwerp University HospitalAntwerp Belgium
12. Child HealthUniversity of Aberdeen UK