Campbell S D Roxburgh1,2, Martin R Weiser3. 1. Colorectal Service, Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, USA. 2. Institute of Cancer Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK. 3. Colorectal Service, Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, USA. weiser1@mskcc.org.