Affiliation: | 1. Department of Health Policy and Management, Fielding School of Public Health, University of California, Los Angeles, CA;2. Division of General Internal Medicine and Health Services Research, Department of Medicine, David Geffen School of Medicine, UCLA, Los Angeles, CA;3. Optum, United Health Group, Minneapolis, MN;4. Optum, United Health Group, San Francisco, CA;5. Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, CA |