1. VA Informatics and Computing Infrastructure, VA Salt Lake City Health Care System, Salt Lake City, Utah, USA.
2. Division of Epidemiology, Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA.
3. Department of Family and Preventive Medicine, University of Utah, Salt Lake City, Utah, USA.
4. Suzanne Dworak-Peck School of Social Work, University of Southern California, Los Angeles, California, USA.
5. Center for Health Equity Research and Promotion, VA Pittsburgh Healthcare System, Pittsburgh, Pennsylvania, USA.