1. Quality Enhancement Research Initiative, U.S. Department of Veterans Affairs, Washington, District of Columbia, USA
2. Department of Learning Health Science, University of Michigan Medical School, Ann Arbor, Michigan, USA;
3. RAND Corporation, Pittsburgh, Pennsylvania, USA
4. Center for Health Equity Research and Promotion, VA Pittsburgh Healthcare System, Pittsburgh, Pennsylvania, USA
5. Mental Illness Research, Education, and Clinical Center, VA Pittsburgh Healthcare System, Pittsburgh, Pennsylvania, USA
6. Departments of Medicine and Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
7. Institute for Social Research and Department of Statistics, University of Michigan, Ann Arbor, Michigan, USA