1. Department of Public Health and Primary Care; Centre for Environment and Health; KU Leuven; Leuven Belgium
2. Centre for Research in Environmental Epidemiology (CREAL); Barcelona Spain
3. CIBER Epidemiologia y Salud Pública (CIBERESP); Barcelona Spain
4. Hospital del Mar Medical Research Institute (IMIM); Barcelona Spain
5. Universitat Pompeu Fabra (UPF); Barcelona Spain
6. Helmholtz Zentrum München; German Research Centre for Environmental Health; Institute of Epidemiology I; Neuherberg Germany
7. Division of Environmental Epidemiology; Institute for Risk Assessment Sciences; Utrecht University; Utrecht The Netherlands
8. Department of Clinical Science and Education; Södersjukhuset; Karolinska Institutet; Stockholm Sweden
9. Sach's Children's Hospital; Stockholm Sweden
10. Institute for Environmental Medicine; Karolinska Institutet; Stockholm Sweden
11. Department of Environmental Immunology; FZ-Helmholtz Centre for Environmental Research Leipzig; Leipzig Germany
12. Institute of Social Medicine, Epidemiology and Health Economics; Charité - Universitätsmedizin Berlin; Berlin Germany
13. Klinik für Pädiatrie m. S. Pneumologie und Immunologie; Charité - Universitätsmedizin Berlin; Berlin Germany
14. Centre for Nutrition, Prevention and Health Services; National Institute for Public Health and the Environment (RIVM); Bilthoven The Netherlands
15. Centre for Environmental Sciences; Hasselt University; Hasselt Belgium
16. Comprehensive Pneumology Center Munich (CPC-M); German Center for Lung Research (DZL); Munich Germany
17. Institute of Clinical Epidemiology and Biometry; University of Wuerzburg; Wuerzburg Germany
18. Area de Salud de Menorca; IB-SALUT; Menorca Spain