1. Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, North Carolina, USA
2. Division of Epidemiology, Department of Public Health Sciences, School of Medicine, University of California–Davis, Davis, California, USA
3. Department of Environmental Medicine, and
4. Department of Toxic Organic Pollutants, Slovak Medical University, Bratislava, Slovakia