1. Department of Economics, Applied Statistics, and International Business, New Mexico State University, Las Cruces, NM
2. Division of General Internal Medicine, Department of Medicine, University of California, San Francisco, San Francisco, CA
3. University of California, Davis, Davis, CA
4. Kaiser Permanente Washington Health Research Institute, Seattle, WA
5. Department of Surgery, University of Vermont Cancer Center, Burlington, VT
6. Department of Radiology, University of Vermont Cancer Center, Burlington, VT
7. Department of Radiology, University of North Carolina, Chapel Hill, NC
8. General Internal Medicine Section, Department of Veteran Affairs, University of California, San Francisco, San Francisco, CA
9. Departments of Medicine and Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, CA