1 Department of Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.
2 Department of Surgery, Pennsylvania State University Medical Center, Hershey, PA, USA.
3 Division of Colorectal Surgery, Department of Surgery, University of Pittsburgh Medical Center, USA.
4 University of Texas, Southwestern Medical Center, USA.
5 Department of Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA; Division of Colorectal Surgery, Department of Surgery, University of Pittsburgh Medical Center, USA.
6 Department of Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA; Division of Colorectal Surgery, Department of Surgery, University of Pittsburgh Medical Center, USA. Electronic address: holdermurrayjm@upmc.edu.