1. West Middlesex University Hospital Chelsea and Westminster Foundation Trust London UK
2. Centre for Paediatrics and Child Health Imperial College, London London UK
3. Department of Emergency Medicine Massachusetts General Hospital Harvard Medical School Boston Massachusetts USA
4. Allergy & Clinical Immunology Laboratory Second Department of Pediatrics National and Kapodistrian University of Athens (NKUA) School of Medicine P. and A. Kyriakou Children’s Hospital Athens Greece
5. Second Department of Paediatrics P. and A. Kyriakou Children’s Hospital Athens Greece
6. Department of Paediatric Pulmonology School of Medicine Pontificia Universidad Catolica de Chile Santiago Chile
7. Department of Pediatric Pneumology and Allergy The Medical University of Warsaw Warsaw Poland
8. Department of Pediatrics Turku University Hospital and Turku University Turku Finland
9. National Heart and Lung Institute Imperial College, London London UK
10. Third Department of Paediatrics Attikon University General Hospital School of Medicine National and Kapodistrian University of Athens Athens Greece
11. Division of Infection, Immunity and Respiratory Medicine University of Manchester Manchester UK