1. Occupational and Environmental Epidemiology Branch and
2. Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, California;
3. Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, Washington;
4. Metabolic Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Rockville, Maryland;
5. Institute for Risk Assessment Sciences, Division of Environmental Epidemiology, Utrecht University, Utrecht, the Netherlands; and
6. University Medical Center Utrecht, Utrecht, the Netherlands