1. Department of Research and Evaluation, Kaiser Permanente Southern California, Pasadena, California
2. Department of Radiology and Biomedical Imaging
3. Department of Epidemiology and Biostatistics, and
4. Philip R. Lee Institute for Health Policy Studies, University of California, San Francisco, San Francisco, California
5. Department of Medicine and
6. Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California
7. Department of Public Health Sciences, School of Medicine, University of California, Davis, Davis, California
8. Department of Radiology, National Jewish Health, Denver, Colorado
9. Department of Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
10. The Center for Health Research, Kaiser Permanente Northwest, Portland, Oregon
11. Department of Medicine, Mayo Clinic, Scottsdale, Arizona; and
12. Kaiser Permanente Washington Health Research Institute, Seattle, Washington