1. Department of Surgery University of Virginia Charlottesville Virginia USA
2. Department of Surgery University of Maryland Baltimore Maryland USA
3. Department of Surgery Duke University Durham North Carolina USA
4. Department of Surgery University of Pennsylvania Philadelphia Pennsylvania USA
5. Department of Surgery SUNY Downstate Brooklyn New York USA
6. Department of Surgery Emory University Atlanta Georgia USA
7. Department of Surgery Memorial Sloan Kettering Cancer Center New York City New York USA