1. 1Departments of Internal Medicine and Epidemiology, University of Michigan, Rogel Cancer Center, Ann Arbor, Michigan.
2. 2Department of Research and Evaluation, Kaiser Permanente Southern California, Pasadena, California.
3. 3Department of Hematology/Oncology, Kaiser Permanente Los Angeles Medical Center, Los Angeles, California.
4. 4Department of Hematology/Oncology, Kaiser Permanente Anaheim Medical Center, Anaheim, California.
5. 5Department of Health Systems Science, Kaiser Permanente Bernard J. Tyson School of Medicine, Pasadena, California.