1. Department of Radiology, University of Washington, Seattle
2. Kaiser Permanente Washington Health Research Institute, Seattle
3. Department of Psychiatry and Behavioral Science, University of Washington, Seattle
4. Office of Health Promotion Research, Department of Surgery, College of Medicine, University of Vermont, Burlington
5. General Internal Medicine Section, Department of Medicine, Department of Veterans Affairs, San Francisco, California
6. Department of Epidemiology and Biostatistics, Department of Veterans Affairs, San Francisco, California
7. University of California, San Francisco
8. Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston
9. Cancer Control Department, American Cancer Society, Atlanta, Georgia
10. Department of Radiology, The University of North Carolina at Chapel Hill
11. Department of Epidemiology, School of Public Health, University of Illinois at Chicago
12. Department of Public Health Sciences, School of Medicine, University of California, Davis