1. Department of Surgery, University of Chicago, Chicago, Illinois
2. Division of Research and Optimal Patient Care, American College of Surgeons, Chicago, Illinois
3. Department of Surgery, Loyola University Medical Center, Maywood, Illinois
4. Department of Surgery, UCLA (University of California, Los Angeles)
5. Department of Surgery, Duke University, Durham, North Carolina
6. Department of Surgery, McGill University, Montreal, Quebec, Canada