1. National Institute for Public Health and the Environment (RIVM), Bilthoven, Netherlands
2. Institute for Risk Assessment Sciences (IRAS), Utrecht University, Utrecht, Netherlands
3. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, Netherlands
4. Department of Epidemiology, Groningen Research Institute for Asthma and COPD (GRIAC), University of Groningen, University Medical Center Groningen, Groningen, Netherlands