1. Department of Emergency Medicine, Baylor College of Medicine, Houston, Texas
2. Section of Health Services Research, Department of Medicine, Center for Innovations in Quality, Effectiveness and Safety, DeBakey VA Medical Center; Houston, Texas
3. Department of Emergency Medicine, University of California, San Francisco
4. National Clinician Scholars Program, Philip R Lee Institute of Health Policy Studies, University of California, San Francisco
5. Philip R Lee Institute of Health Policy Studies, University of California, San Francisco
6. Department of Psychiatry and Behavioral Sciences, University of California; San Francisco
7. San Francisco Veterans Affairs Health Care System, San Francisco, California
8. Department of Emergency Medicine, University of California, Davis, Sacramento
9. School of Medicine, University of California, Davis, Sacramento
10. Department of Epidemiology and Biostatistics, University of California, San Francisco