1. Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee
2. Center for Health Equity Research and Promotion, VA Pittsburgh Healthcare System, Pittsburgh, Pennsylvania
3. Department of Biostatistics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania
4. Center for Innovations in Quality, Effectiveness and Safety, Michael E. DeBakey VA Medical Center, Houston, Texas
5. Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, Texas
6. Department of Surgery, University of Texas Health San Antonio, San Antonio
7. South Texas Veterans Health Care System, San Antonio
8. Division of Vascular Surgery, Stanford University School of Medicine, Stanford, California
9. Surgical Service Line, VA Palo Alto Healthcare System, Palo Alto, California
10. Division of Health Services Research and Development, VA Palo Alto Healthcare System, Palo Alto, California
11. Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania
12. Wolff Center, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania