Helicobacter pylori Is Associated With Precancerous and Cancerous Lesions of the Gastric Cardia Mucosa: Results of a Large Population-Based Study in China by Shuanghua Xie, Shaoming Wang, Liyan Xue, Daniel R. S. Middleton, Chentao Guan, Changqing Hao, Jinwu Wang, Bianyun Li, Ru Chen, Xinqing Li, Wenqiang Wei

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