Authors: Donald Poon, Benjamin O. Anderson, Li‐Tzong Chen, Kōichi Tanaka, Wan Yee Lau, Eric Van Cutsem, Harjit Singh, Wan Cheng Chow, London Lucien Ooi, Pierce K. H. Chow, Maung Win Khin, Wen Hsin Koo - The Lancet 2009 cited by 418