1. Baylor University Medical Center, Dallas, Texas.
2. JPS Health Network, Fort Worth, Texas.
3. Departments of Surgery and Public Health Sciences, University of Virginia; Charlottesville, Virginia.
4. Department of Surgery, University of Toronto, Toronto, Ontario, Canada.
5. Department of Surgery, University of Washington; Seattle, Washington.
6. Departments of Surgery, Anesthesiology, Critical Care Medicine, and Nursing, The Johns Hopkins University Schools of Medicine and Nursing, Baltimore, Maryland.
7. Department of Surgery, Wake Forest-Baptist Health, Winston-Salem, North Carolina.
8. Department of Surgery, Beth Israel Deaconess-Harvard Medical School, Boston, Massachusetts.
9. Department of Surgery, University of Virginia, Charlottesville, Virginia.
10. Department of Surgery, Brigham and Women's Hospital, Boston, Massachusetts.