1. Department of Epidemiology, Lazio Region Health Service, Rome, Italy
2. Department of Hygiene, Epidemiology and Medical Statistics, Medical School, University of Athens, Athens, Greece
3. Department of Epidemiology and Environmental Health, Regional Environmental Protection Agency, Piedmont, Italy
4. Centre for Research in Environmental Epidemiology, Barcelona, Spain
5. Air Pollution Epidemiology Section, Office of Environmental Health Hazard Assessment, California Environmental Protection Agency, Oakland, California, USA
6. INSERM U1018, CESP–Centre for research in Epidemiology and Population Health, UMRS U1018, Respiratory and Environmental Epidemiology Team, University Paris Sud, Villejuif, France
7. CIBER Epidemiología y Salud Pública (CIBERESP), Madrid, Spain
8. Cancer and Environmental Epidemiology Unit, National Centre for Epidemiology, Carlos III Institute of Health, Madrid, Spain
9. Unité Air Eau et Climat, Département Santé Environnement Institut de Veille Sanitaire, Saint-Maurice Cedex, France
10. Epidemiology Unit, Local Health Authority, Milan, Italy
11. Regional Centre for Environment and Health, Regional Environmental Protection Agency–Emilia-Romagna, Modena, Italy
12. Epidemiology Observatory, Department of Public Health, Local Health Authority, Bologna, Italy