1. Department of Research and Evaluation, Kaiser Permanente Southern California, Pasadena
2. Department of Cardiology, Kaiser Permanente Los Angeles Medical Center, Los Angeles, California
3. Kaiser Permanente Center for Effectiveness and Safety Research, Pasadena, California
4. Department of Health System Science, Kaiser Permanente Bernard J. Tyson School of Medicine, Pasadena, California
5. Department of Emergency Medicine, Kaiser Permanente Los Angeles Medical Center, Los Angeles, California
6. Price School of Public Policy, University of Southern California, Los Angeles