1. HSR Center for the Study of Healthcare Innovation, Implementation & Policy (CSHIIP), VA Greater Los Angeles Healthcare System , Los Angeles, CA 90073 , United States
2. Division of General Internal Medicine and Health Services Research, Department of Medicine, David Geffen School of Medicine, University of California , Los Angeles, CA 90024 , United States
3. US Department of Veterans Affairs, Office of Health Equity , Washington, DC 20420 , United States
4. Office of the Chief of Staff, VA Greater Los Angeles Healthcare System , Los Angeles, CA 90073 , United States