1. Industrial Economics Inc., Cambridge, Massachusetts, USA
2. Harvard School of Public Health, Department of Biostatistics, Boston, Massachusetts, USA
3. Health and Environmental Group, Centre Hospitalier Universitaire de Quebec, Quebec, Canada
4. Johns Hopkins School of Public Health, Department of Epidemiology, Baltimore, Maryland, USA
5. National Center for Cardiovascular Research, Department of Cardiovascular Epidemiology and Population Genetics, Madrid, Spain
6. George Perkins Marsh Institute, Clark University, Worcester, Massachusetts, USA
7. Office of Environmental Health Assessment, Washington State Department of Health, Olympia, Washington, USA
8. Harvard School of Public Health, Department of Environmental Health/Department of Epidemiology, Boston, Massachusetts, USA
9. Independent Consultant, Metuchen, New Jersey, USA
10. Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland
11. National Center for Environmental Assessment, U.S. Environmental Protection Agency, Cincinnati, Ohio, USA