1. Department of Emergency Medicine; Oregon Health and Science University; Portland; OR
2. Department of Medicine; Veterans Affairs Palo Alto Health Care System; Stanford School of Medicine; Palo Alto; CA
3. Department of Sociology; University of California-Los Angeles; Los Angeles; CA
4. Department of Research and Evaluation; Kaiser Permanente Southern California; Pasadena; CA
5. RAND Health; Santa Monica; CA
6. Olive View-UCLA Emergency Medicine Center; Sylmar; CA
7. Emergency Medicine Center; Ronald Reagan UCLA; Los Angeles; CA