1. Radiation Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, U.S. Department of Health and Human Services, 9609 Medical Center Dr, Bethesda, MD 20892.
2. Departments of Radiology and Medicine, Columbia University Medical Center, New York, NY.
3. Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, MD.
4. Division of Environmental Health Sciences, School of Public Health, University of Minnesota, Minneapolis, MN.
5. Hirosoft International, Eureka, CA.