1. VA HSR&D Center of Excellence for the Study of Healthcare Provider Behavior, VA Greater Los Angeles Healthcare System, Sepulveda, California.
2. Department of Medicine, University of California Los Angeles (UCLA) School of Medicine, Los Angeles, California.
3. Department of Health Services, UCLA School of Public Health, Los Angeles, California.
4. Center for Health Equity Research and Promotion (CHERP), VA Pittsburgh Healthcare System, Pittsburgh, Pennsylvania.
5. Department of Sociology, University of Pittsburgh, Pittsburgh, Pennsylvania.
6. Department of Psychiatry, University of Pittsburgh, Western Psychiatric Institute and Clinics, Pittsburgh, Pennsylvania.
7. Departments of Health Evaluation Sciences and Obstetrics and Gynecology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania.
8. National Committee for Quality Assurance, Research and Analysis, Washington, DC.