1 Radcliffe Department of Medicine, University of Oxford, Oxford OX3 9DS, United Kingdom; Oxford-Sichuan Gastrointestinal Cancer Centre, University of Oxford, Oxford OX3 9DS, United Kingdom. Electronic address: david.kerr@ndcls.ox.ac.uk.
2 Oxford-Sichuan Gastrointestinal Cancer Centre, University of Oxford, Oxford OX3 9DS, United Kingdom; Department of Hepatology and Gastroenterology, Sichuan University, Chengdu, China.