1. Department of Family & Community Medicine, University of Texas Health Science Center at San Antonio, Joe R. & Teresa Lozano Long School of Medicine.
2. Department of Family Medicine, Boston University School of Medicine/Boston Medical Center, Boston, Massachusetts.
3. Analysis Group, Boston, Massachusetts.
4. Center for Healthcare Organization and Implementation Research, VA Boston Healthcare System, and Department of Health Policy and Management, Boston University School of Public Health, Boston, Massachusetts.