1. Division of Cancer Epidemiology and Genetics, National Cancer Institute, National
Institutes of Health, Department of Health Human Services, Bethesda, Maryland,
2. Department of Health Risk Analysis and Toxicology, University of Maastricht, Maastricht, the
Netherlands
3. Institut National de Santé Publique, du Québec and Unité de
recherche en santé publique, Centre Hospitalier Universitaire
de Québec, Québec, Canada
4. Texas A & M School of Rural Public Health, College Station, Texas
5. Southern Denmark University, Odense, Denmark
6. Washington State Department of Health, Olympia, Washington
7. U.S. Geological Survey, Reston, Virginia