1. Child Health, University of Aberdeen, UK
2. Department of Biostatistics, University of Liverpool, Liverpool, UK
3. Department of Respiratory Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
4. Division of Pharmacoepidemiology & Clinical Pharmacology, University of Utrecht, Utrecht, The Netherlands
5. CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
6. Academic Department of Paediatrics, Royal Alexandra Children's Hospital, Brighton & Sussex Medical School, Brighton, UK
7. Population Pharmacogenetics Group, University of Dundee, UK
8. Department of Bioengineering & Therapeutic Sciences & Medicine, University of California, San Francisco, CA, USA
9. Center for Genes, Environment & Health, University of California, San Francisco, CA, USA
10. Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
11. Sachs’ Children's Hospital, Södersjukhuset, Stockholm, Sweden