1 Division of Colon and Rectal Surgery, University of Minnesota, Minneapolis, Minnesota.
2 Department of Surgery, Papa Giovanni XXIII Hospital, Bergamo, Italy.
3 Department of Colorectal Surgery, Surgical Outcomes Research Centre (SOuRCe), RPA Institute of Academic Surgery, Royal Prince Alfred Hospital, Sydney, Australia.
4 Rectal Cancer Unit, Basingstoke and North Hampshire Hospital, Basingstoke, United Kingdom.
5 Department of Surgery, University of Iowa Hospitals and Clinics, Iowa City, Iowa.