Helicobacter pylori prevalence and CagA status among children in two counties of China with high and low risks of gastric cancer.
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M. Blaser | M. Gail | J. Fraumeni | G. Perez-Perez | K. Pan | W. You | J. Jiang | L. Zhang | Y. S. Chang | G. W. Xu | J. Ma | W. Liu | J. Ma