1. Working Group Air Pollution, European Community Respiratory Health Survey, London, United Kingdom, and Barcelona, Spain
2. Keck School of Medicine, University of Southern California, Los Angeles, California, USA
3. Lung Biology, Pharmaceutical Sciences Research Division, King’s College, London, United Kingdom
4. Institut fuer Umweltmedizinische Forschung, Duesseldorf, Germany
5. Hubei Provincial Center for Disease Control and Prevention, Hubei, People’s Republic of China
6. Department of Public Health Sciences, Kings College, London, United Kingdom
7. Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden
8. Institute of Social and Preventive Medicine, University of Basel, Basel, Switzerland
9. GSF–National Research Centre for Environment and Health, Institute of Epidemiology, Neuherberg, Germany
10. Department of Occupational and Environmental Medicine, University Hospital Uppsala, Uppsala, Sweden
11. Hospital Central de Asturias, Oviedo, Spain
12. Department of Medicine and Public Health, University of Verona, Verona, Italy
13. Institut Municipal de Investigacio Medica, Barcelona, Spain
14. Centre of Expertise in Life Sciences, Zuyd University, Heerlen, the Netherlands