1. Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Rockville, Maryland, USA
2. Yale School of Public Health, New Haven, Connecticut, USA
3. Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, North Carolina, USA
4. Core Genotyping Facility, NCI-Frederick, Frederick, Maryland, USA