1. Center for Health Equity Research and Promotion, VA Pittsburgh Healthcare System, Pittsburgh, Pennsylvania
2. Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
3. Informatics, Decision-Enhancement and Analytic Sciences Center, VA Salt Lake City Health Care System, Salt Lake City, Utah
4. Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City
5. Department of Biostatistics, University of Pittsburgh Graduate School of Public Health, Pittsburgh, Pennsylvania