1. From Veterans Affairs Greater Los Angeles Health System, Veterans Affairs Health Services Research and Development Service Center for the Study of Healthcare Innovation, Implementation & Policy, and David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California; David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California;
2. and David Geffen School of Medicine and Jonathan and Karin Fielding School of Public Health, University of California, Los Angeles, Los Angeles, California.