8Yuan JM, Yu MC, Xu WW, et al. Helicohacter pylori infection and risk of gastric cancer in Shanghai, China: updated resultsbased upon a locally developed and validated assay and further follow-up of the cohort [J ]. Cancer Epidemiol Biomarkers &Prev, 1999,8 : 621.
9Gao YT, McLaughlin JK, Blot WJ, et al. Reduced risk of esophageal cancer with green tea consumption[J]. J Natl Cancer Inst,1994,86(11) : 855.
10Ji BT, Chow WH, Yang G, et al. Dietary habits and stomach cancer in Shanghai, China[J]. Int J Cancer,1998,76:659.
