1. Department of Internal Medicine, University of California, Davis, Sacramento, California, USA.
2. Division of General Internal Medicine and Health Services Research, University of California, Los Angeles, Los Angeles, California, USA.
3. Division of Endocrinology, Diabetes and Metabolism, University of California, Los Angeles, Los Angeles, California, USA.
4. HSR&D Center for the Study of Healthcare Innovation, Implementation and Policy, VA Greater Los Angeles Health System, Los Angeles, California, USA.