1. Department of Surgery, W. G. (Bill) Hefner Veterans Affairs (VA) Health Care System, Salisbury, North Carolina
2. Department of Surgery, Wake Forest University, Winston-Salem, North Carolina
3. Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, Maryland
4. Department of Surgery, VA Boston Health Care System, Boston, Massachusetts
5. Department of Surgery, Boston University, Boston, Massachusetts
6. Department of Surgery, Harvard Medical School, Boston, Massachusetts
7. Department of Surgery, VA Pittsburgh Healthcare System, Pittsburgh, Pennsylvania
8. Department of Cardiothoracic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
9. Department of Surgery, Kansas Veterans Affairs Medical Center (VAMC), Kansas City, Missouri
10. Department of Surgery, University of Missouri, Kansas City
11. Department of Surgery, Miami VAMC, Miami, Florida
12. Department of Surgery, University of Miami School of Medicine, Miami, Florida
13. Department of Surgery, University of Rochester School of Medicine, Rochester, New York
14. Department of Surgery, West Haven VAMC, West Haven, Connecticut
15. Department of Surgery, Yale University School of Medicine, New Haven, Connecticut
16. Department of Surgery, Brooklyn VAMC, Brooklyn, New York
17. VA Maryland Health Care System, Baltimore
18. Department of Surgery, University of Maryland School of Medicine, Baltimore
19. Department of Surgery, Cleveland VAMC, Cleveland, Ohio
20. Department of Surgery, Madison VAMC, Madison, Wisconsin
21. Department of Surgery, University of Wisconsin, Madison
22. JFK Medical Center, West Palm Beach, Florida