1. Department of Epidemiology, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
2. Groningen Research Institute for Asthma and COPD (GRIAC), University of Groningen, University Medical Center Groningen, Groningen, Netherlands
3. Department of Genetics, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
4. Department of Pulmonary Diseases, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
5. Department of Epidemiology, Erasmus Medical Center, Rotterdam, Netherlands
6. Institute of Epidemiology II, Helmholtz Zentrum München, Neuherberg, Germany
7. Environmental Public Health Division, U.S. Environmental Protection Agency, Chapel Hill, North Carolina, USA
8. Molecular Epidemiology Unit, Helmholtz Zentrum München, Neuherberg, Germany
9. Institute for Risk Assessment Sciences, Utrecht University, Utrecht, Netherlands
10. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Netherlands