1. Centre for Research in Environmental Epidemiology (CREAL), Barcelona, Spain
2. CIBER Epidemiología y Salud Pública (CIBERESP), Madrid, Spain
3. Universitat Pompeu Fabra, Barcelona, Spain
4. Team of Environmental Epidemiology Applied to Reproduction and Respiratory Health, IAB (Institut Albert Bonniot), INSERM (National Institute of Health and Medical Research), U823, Grenoble, France
5. Institute for Risk Assessment Sciences, Utrecht University, Utrecht, the Netherlands
6. Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
7. University Joseph Fourier, Grenoble, France
8. Department of Social Medicine, University of Copenhagen, Copenhagen, Denmark
9. Department of Epidemiology, Lazio Regional Health Service, Rome, Italy
10. Department of Epidemiology and Public Health, Swiss Tropical & Public Health Institute, Basel, Switzerland
11. University of Basel, Basel, Switzerland
12. Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
13. TNO (Netherlands Organisation for Applied Scientific Research), Utrecht, the Netherlands
14. Institut für umweltmedizinische Forschung, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
15. Finnish Meteorological Institute, Helsinki, Finland
16. Groningen Research Institute for Asthma and COPD, and
17. Department of Pulmonary Diseases, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
18. Danish Cancer Society Research Centre, Copenhagen, Denmark
19. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, the Netherlands
20. IMIM (Hospital del Mar Research Institute), Barcelona, Spain
21. Department of Public Health, Academic Medical Centre, University of Amsterdam, Amsterdam, the Netherlands
22. Department of Hygiene, Social and Environmental Medicine, Ruhr-University Bochum, Bochum, Germany
23. Department of Occupational and Environmental Health, Stockholm County Council, Stockholm, Sweden