1. Division of Health Policy and Management, University of Minnesota School of Public Health, Minneapolis
2. Leonard D. Schaeffer Center for Health Policy & Economics, University of Southern California, Los Angeles
3. Department of Health Policy and Management, Sol Price School of Public Policy, University of Southern California, Los Angeles
4. Division of General Internal Medicine and Health Services Research, Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles
5. Department of Health Policy and Management, Fielding School of Public Health, University of California, Los Angeles
6. Department of Health Policy and Management, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland
7. Analysis Group, Inc, Los Angeles, California