1. Department of Hygiene and Epidemiology, University of Athens Medical School, Athens, Greece
2. Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
3. McLaughlin Centre for Population Health Risk Assessment, University of Ottawa, Ottawa, Ontario, Canada
4. Environmental Health and Consumer Products Branch, Health Canada, Ottawa, Ontario, Canada
5. Health Effects Institute, Boston, Massachusetts, USA
6. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA