1. American College of Surgeons, Chicago, Illinois
2. Department of Surgery, University of Chicago Medicine, Chicago, Illinois
3. Surgical Center for Outcomes Research, Section of Endocrine Surgery, Department of Surgery, Duke University Medical Center, Durham, North Carolina
4. Department of Surgery, David Geffen School of Medicine at UCLA (University of California, Los Angeles), Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, California
5. Center for Health Policy and the Olin Business School, Department of Surgery, Washington University at St Louis, St Louis, Missouri
6. St Louis Veterans Affairs Medical Center, St Louis, Missouri
7. BJC Healthcare, St Louis, Missouri