1. David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, CA, USA
2. RAND Corporation, Santa Monica, CA, USA
3. T.H. Chan School of Public Health, Harvard University, Boston, MA, USA
4. College of Nursing and Health Professions, Drexel University, Philadelphia, PA, USA
5. Quality Improvement Resource Center, Greater Los Angeles VA Health Care System, Los Angeles, CA, USA
6. Stanford University School of Medicine, Stanford, CA, USA
7. VA Palo Alto Health Care System, Palo Alto, CA, USA
8. Pennsylvania State College of Medicine, Lebanon, PA, USA
9. Fielding School of Public Health, University of California at Los Angeles, Los Angeles, CA, USA