1. Department of Veterans Affairs, Eastern Colorado Health Care System, Denver, Colorado.
2. Department of Medicine, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, Colorado.
3. Department of Family Medicine and Colorado Health Outcomes Program, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, Colorado.
4. VA Palo Alto Health Care System, Palo Alto, California.
5. Department of Health and Behavioral Sciences, University of Colorado, Denver, Colorado.