Deborah S Keller1,2, Steven D Wexner3, Manish Chand2. 1. Division of Colon and Rectal Surgery, Department of Surgery, Columbia University Medical Center, New York, New York. 2. GENIE Centre, University College London, London, United Kingdom. 3. Division of Colorectal Surgery, Department of Surgery, Cleveland Clinic Florida, Weston, Florida.