1. Department of Surgery University of Michigan Medicine Ann Arbor Michigan USA
2. Department of Surgery Emory University School of Medicine Atlanta Georgia USA
3. Department of Surgery Washington University School of Medicine St. Louis Missouri USA
4. Department of Surgery (Surgical Oncology) Stony Brook University Hospital Stony Brook New York USA
5. Division of General Surgery, Section of Colon and Rectal Surgery Vanderbilt University Medical Center Nashville Tennessee USA