1. Greater Los Angeles Veterans Administration Healthcare System, Los Angeles, California
2. University of California, Los Angeles National Clinician Scholars Program, Los Angeles, California
3. Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles, California
4. Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, California
5. Department of Emergency Medicine, State University of New York Downstate Kings County, New York
6. Division of General Internal Medicine and Health Services Research, David Geffen School of Medicine at UCLA, Los Angeles, California
7. Department of Health Policy and Management, Fielding School of Public Health at UCLA, Los Angeles, California