1 VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA.
2 Department of Medicine, University of California Los Angeles (UCLA) Geffen School of Medicine, Los Angeles, CA, USA.
3 Veterans Integrated Health System 21, Pleasant Hill, CA, USA.
4 VA Health Services Research & Development Center for the Study of Healthcare Innovation, Implementation, and Policy, Los Angeles, CA, USA.
5 RAND Corporation, Santa Monica, CA, USA.
6 Department of Biostatistics, UCLA Fielding School of Public Health, Los Angeles, CA, USA.
7 VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA. Donna.Washington@va.gov.
8 Department of Medicine, University of California Los Angeles (UCLA) Geffen School of Medicine, Los Angeles, CA, USA. Donna.Washington@va.gov.
9 VA Health Services Research & Development Center for the Study of Healthcare Innovation, Implementation, and Policy, Los Angeles, CA, USA. Donna.Washington@va.gov.