1. Surveillance Research Program; Intramural Research Department; American Cancer Society; Atlanta Georgia
2. Division of Cancer Prevention and Control; National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention; Atlanta Georgia
3. Cancer Prevention Institute of California; Fremont California
4. Department of Health Research and Policy; Stanford University School of Medicine; Palo Alto California
5. Department of Medicine; University of California at San Francisco School of Medicine; San Francisco California