1. Respiratory and Allergy Units; Arrixaca University Children's Hospital; University of Murcia & IMIB Research Institute; Murcia Spain
2. Asthma UK; London UK
3. Department of Paediatric Respiratory Medicine; Great Ormond Street Hospital for Children; London UK
4. Department of Respiratory, Critical Care and Anaesthesia Unit; University College London (UCL) Great Ormond Street Institute of Child Health; London UK
5. Women's and Children's Health Department; University of Padua; Padova Italy
6. Children's Hospital & Research Institute; Marienhospital Wesel; Wesel Germany
7. Department of Respiratory Medicine; University of Liege; Liege Belgium
8. Paediatric Pulmonology Unit; Hospital Vall d'Hebron; Universitat Autònoma de Barcelona; Barcelona Spain
9. Department of Clinical and Experimental Medicine; Section of Paediatrics; University of Pisa; Pisa Italy
10. Paediatrics/Paediatric Respiratory Medicine; Erasmus MC - Sophia Children's Hospital; Rotterdam The Netherlands
11. Department of Paediatrics; Athens University Medical School; Attikon General Hospital; Athens Greece
12. Department of Paediatrics; University Hospital; Düsseldorf Germany