1. National Exposure Research Laboratory, U.S. Environmental Protection Agency, Athens, Georgia, USA
2. National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA
3. Centre for Research in Environmental Epidemiology, Barcelona, Spain
4. Municipal Institute of Medical Research, Hospital del Mar, Barcelona, Spain
5. CIBER Epidemiología y Salud Pública, Barcelona, Spain
6. Medical School, University of Athens, Greece
7. Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research, Barcelona, Spain
8. Institute for Risk Assessment Sciences, Division for Environmental Epidemiology, Utrecht University, Utrecht, the Netherlands
9. CanSyn Chem. Corp., Toronto, Ontario, Canada
10. Grup de Mutagènesi, Departament de Genètica i de Microbiologia, Edifici Cn, Universitat Autònoma de Barcelona, Bellaterra, Cerdanyola del Vallès, Spain