1. Centre for Research in Environmental Epidemiology, Barcelona, Spain
2. Municipal Institute of Medical Research, Hospital del Mar, Barcelona, Spain
3. CIBER Epidemiologia y Salud Pública, Barcelona, Spain
4. National School of Public Health, Athens, Greece
5. Grup de Mutagénesi, Departament de Genética i de Microbiologia, Universitat Autònoma de Barcelona, Bellaterra, Cerdanyola del Vallés, Spain
6. Centre for Genomic Regulation, Barcelona, Spain
7. Institute of Environmental Assessment and Water Research, Barcelona, Spain
8. National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA
9. Federal Environmental Agency, Bad Elster, Germany