1. Division of General Internal Medicine and Health Services Research, Department of Medicine, University of California, Los Angeles, CA, USA
2. VA HSR&D Center for the Study of Healthcare Innovation, Implementation, & Policy, Los Angeles, CA, USA
3. Department of Epidemiology, Fielding School of Public Health, University of California, Los Angeles, CA, USA
4. Division of Infectious Diseases, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
5. Department of Biostatistics, Fielding School of Public Health, University of California, Los Angeles, CA, USA
6. Department of Family Medicine, University of California, Los Angeles, CA, USA
7. Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, CA, USA