1. Department of Radiology; The University of North Carolina; Chapel Hill North Carolina
2. Department of Community and Family Medicine; Geisel School of Medicine at Dartmouth; Hanover New Hampshire
3. Department of Biostatistics and Epidemiology; University of Pennsylvania; Philadelphia Pennsylvania
4. Department of Biostatistics; University of Washington; Seattle Washington
5. Moffitt Cancer Center; Tampa Florida
6. Department of Radiology; University of Wisconsin; Madison Wisconsin
7. Group Health Research Institute; Seattle Washington
8. Departments of Medicine and Epidemiology and Biostatistics; University of California at San Francisco; San Francisco California
9. General Internal Medicine Section; Department of Veterans Affairs; University of California at San Francisco; San Francisco California
10. School of Public Health; Division of Health Policy and Management; University of Minnesota; Minneapolis Minnesota
11. The Dartmouth Institute for Health Policy and Clinical Practice and Norris Cotton Cancer Center; Geisel School of Medicine at Dartmouth; Hanover New Hampshire
12. Department of Radiology; Massachusetts General Hospital, Boston; Massachusetts