Baird Daniel L H, Simillis Constantinos, Kontovounisios Christos, Rasheed Shahnawaz, Tekkis Paris P
Department of Colorectal Surgery, Royal Marsden Hospital, London SW3 6JJ, UK.
Department of Surgery and Cancer, Imperial College, London.
BMJ. 2017 Apr 19;357:j1703. doi: 10.1136/bmj.j1703.