1. Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
2. Stress Research Institute, Faculty of Social Sciences, Stockholm University, Sweden
3. Department of Environment and Health at the Federal Environmental Agency, Berlin, Germany
4. National Institute of Public Health and Environmental Protection, Bilthoven, the Netherlands
5. Environmental Epidemiologic Unit, Regional Agency for Environmental Protection, Piedmont Region, Grugliasco, Italy
6. Department of Prevention, Azienda Sanitoria Locale 13 Novara, Novara, Italy
7. Laboratory of Prevention, Nurses School, National and Kapodistrian University of Athens, Athens, Greece
8. Department of Hygiene and Epidemiology, National and Kapodistrian University of Athens, Athens, Greece
9. Medical Research Council and the Health Protection Agency, Centre for Environment and Health, Department of Epidemiology and Public Health, Imperial College London, London, United Kingdom