1. Virginia Tech Carilion School of Medicine, 2 Riverside Circle, Roanoke, VA, USA
2. Department of Surgery, Section of Colorectal Surgery, Virginia Tech Carilion School of Medicine, 2 Riverside Circle, Roanoke, VA, USA
3. Department of Basic Science Education, Virginia Tech Carilion School of Medicine, 2 Riverside Circle, Roanoke, VA, USA
4. Dominion Pathology Associates, 1 Riverside Circle, Roanoke, VA 24016, USA