1. Department of Surgery, University of Colorado, Denver, Colorado, USA
2. Program in Global Surgery and Social Change, Harvard Medical School, Boston, Massachusetts, USA
3. Division of Cardiothoracic Surgery, University of Colorado, Denver, Colorado, USA
4. College of Medicine, University of Vermont, Burlington, Vermont, USA
5. George Washington School of Medicine, Washington, Washington DC, USA
6. School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin, USA
7. Harvard Medical School, Boston, Massachusetts, USA
8. School of Medicine, University of Colorado, Denver, Colorado, USA
9. Chris Barnard Division of Cardiothoracic Surgery, University of Cape Town, Cape Town, South Africa