Epidemiology of Helicobacter pylori, gastric precancerous lesions and gastric cancer: a multicenter, population-based cross-sectional study in Nanjing by Chunyan Niu, Yongqiang Song, Yue Chen, Yongqiang Shi, Hui Wang, Xinguo Wu, Xiaoping Wang, Xiangyang Zhao, Yongdan Bu, Jijin Li, Tao Tao, Jinhua Wu, Changlin Xue, Fuyu Zhang, Chunrong Han, Juan Yuan, Qiang Zhang

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