1. Amgen, Inc., Thousand Oaks, California.
2. Cancer Prevention Institute of California, Fremont, California.
3. Department of Public Health Sciences, University of California, Davis, California.
4. California Cancer Registry, Public Health Institute, Sacramento, California.
5. New York State Cancer Registry, Menands, New York.
6. Centers for Disease Control and Prevention-National Program of Cancer Registries, Contractor, Atlanta, Georgia.
7. Division of Cancer Prevention and Control, Centers for Disease Control and Prevention, Atlanta, Georgia.