1. Departments of Medicine and Epidemiology and Biostatistics, University of California, San Francisco
2. General Internal Medicine Section, Department of Veterans Affairs, University of California, San Francisco
3. Kaiser Permanente Washington Health Research Institute, Kaiser Permanente Washington, Seattle
4. Departments of Surgery and Radiology, University of Vermont, Burlington
5. The Dartmouth Institute for Health Policy and Clinical Practice and Norris Cotton Cancer Center, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire
6. Department of Population Health Sciences, University of Utah, Salt Lake City
7. Huntsman Cancer Institute, Salt Lake City, Utah
8. Department of Radiology, University of North Carolina, Chapel Hill
9. School of Public Health, Division of Epidemiology and Biostatistics, University of Illinois at Chicago
10. Department of Public Health Sciences, University of California, Davis
11. Department of Radiology, University of Washington, Seattle