1. Center for the Study of Healthcare Innovation, Implementation and Policy, VA Greater Los Angeles Healthcare System, Los Angeles, California
2. Division of General Internal Medicine, Department of Medicine, VA Greater Los Angeles Healthcare System, Los Angeles, California
3. David Geffen School of Medicine at UCLA, Division of General Internal Medicine, Department of Medicine, University of California, Los Angeles
4. RAND Corporation, Santa Monica, California
5. University of Southern California, Los Angeles