1. Department of Surgery, University of Washington, Seattle
2. Department of Biostatistics, University of Washington, Seattle
3. Department of Research and Evaluation, Kaiser Permanente Research, Pasadena, California
4. Kaiser Permanente Bernard J. Tyson School of Medicine, Pasadena, California
5. Philip R. Lee Institute for Health Policy Studies, Departments of Radiology and Biomedical Imaging, Epidemiology and Biostatistics, University of California, San Francisco, San Francisco
6. Kaiser Permanente Northwest Center for Health Research, Portland, Oregon
7. Kaiser Permanente Washington Health Research Institute, Seattle, Washington
8. Marshfield Clinic Research Institute, Marshfield, Wisconsin