1. Centre for Research in Environmental Epidemiology (CREAL); Barcelona Spain
2. CIBER Epidemiología y Salud Pública (CIBERESP); Barcelona Spain
3. Departament de Ciències Experimentals i de la Salut; Universitat Pompeu Fabra; Barcelona Spain
4. VIB Inflammation Research Center and Department of Respiratory Medicine; Ghent University; Ghent Belgium
5. IMIM (Hospital del Mar Research Institute); Barcelona Spain
6. Julius Center for Health Sciences and Primary Care; University Medical Center Utrecht; Utrecht the Netherlands
7. Inserm; U823; Institut Albert Bonniot; Team of Environmental Epidemiology Applied to Reproduction and Respiratory Health; Grenoble France
8. Université Joseph Fourier; Grenoble France
9. Groupe Hospitalier Trousseau-La Roche-Guyon; Centre de l'Asthme et des Allergies; APHP; Université Paris 6; Paris France
10. Department of Public Health and Biostatistics; EA 4064; Paris Descartes University; Paris France
11. Paris Municipal Department of Social Action, Childhood, and Health; Paris France
12. Institute of Social Medicine, Epidemiology and Health Economics; Charité - Universitätsmedizin Berlin; Berlin Germany
13. Institute of Clinical Epidemiology and Biometry; University of Wuerzburg; Wuerzburg Germany
14. Department of Pediatrics; Charité - Universitätsmedizin Berlin; Berlin Germany
15. Institute of Epidemiology I; Helmholtz Zentrum; Munich Germany
16. Department of Biomedical and Neuromotor Sciences; Alma Mater Studiorum - University of Bologna; Bologna Italy
17. Department of Epidemiology; Lazio Regional Health Service; Rome Italy
18. Pediatric Pulmonology and Pediatric Allergology; GRIAC Research Institute; Beatrix Children's Hospital; University Medical Center Groningen; University of Groningen; Groningen the Netherlands
19. Department of Pulmonology; GRIAC Research Institute; University Medical Center Groningen; University of Groningen; Groningen the Netherlands
20. Department of Pediatrics; Research Institute; Marien-Hospital Wesel; Wesel Germany
21. Division of Pediatric Gastroenterology and Hepatology; Dr von Haunersches Kinderspital; Ludwig-Maximilians-University of Munich; Munich Germany
22. Department of Epidemiology; GRIAC Research Institute; University Medical Center Groningen; University of Groningen; Groningen the Netherlands
23. Institute for Risk Assessment Sciences; Utrecht University; Utrecht the Netherlands
24. Institute of Environmental Medicine; Karolinska Institutet; Stockholm Sweden
25. Sach's Children's Hospital; Stockholm Sweden
26. Department of Dermatology and Allergy Centre; Odense University Hospital; Odense Denmark
27. Department of Paediatrics; Oslo University Hospital and University of Oslo; Oslo Norway
28. National School of Public Health; Athens Greece
29. Inserm (Institut National de la Santé et de la Recherche Médicale); CESP (Centre de recherche en Épidémiologie et Santé des Populations); U1018; Respiratory and Environmental Epidemiology Team; Villejuif France
30. UMRS 1018; Université Paris Sud 11; Villejuif France
31. Hôpital Arnaud de Villeneuve; University Hospital of Montpellier; Montpellier France