1 ﹒王家良﹒临床流行病学— — —临床科研设计、平衡和评价﹒第2版﹒上海:上海科学技术出版社,2001 ﹒.Zagari RM,Eusebi L H,et al ﹒ Meta‐analysis:can Helicobacter pylori eradication treat ment reducethe risk f or gastric cancer? ......