1. Department of Epidemiology and Biostatistics, The University of Texas Health Science Center, San Antonio, Texas.
2. Applied Research Program, National Cancer Institute, Bethesda, Maryland.
3. The Cancer Prevention Institute of California, Fremont, California.
4. Department of Epidemiology, University of Iowa, Iowa City, Iowa.
5. Louisiana Tumor Registry, Louisiana State University Health Sciences Center, New Orleans, Louisiana.
6. Epidemiology Program, Public Health Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, Washington.
7. Department of Pediatrics, Wayne State University, Detroit, Michigan.
8. Information Management Services, Calverton, Maryland.