1. Epidemiology and Community Health Branch, National Heart Lung and Blood Institute, National Institutes of Health Bethesda Maryland USA
2. Occupational and Environmental Epidemiology Branch, Division of Cancer Epidemiology and Genetics National Cancer Institute, National Institutes of Health Rockville Maryland USA
3. Department of Epidemiology Geisel School of Medicine at Dartmouth Lebanon New Hampshire USA
4. Maine Cancer Registry Augusta Maine USA
5. Vermont Cancer Registry Burlington Vermont USA
6. Office of Research and Development, U.S. Environmental Protection Agency Research Triangle Park North Carolina USA
7. Division of Public Health Services New Hampshire Department of Health and Human Services Concord New Hampshire USA