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为了探讨肝癌发病的危险因素及因素间的相互作用模式，对武汉市肝癌危险因素的病例对照调查资料进行协同效应研究。１材料与方法 调查方法：从武汉市恶性肿瘤登记报告中随机抽取１９９６年新发病例３５３人，按照与病例同性别，同一年龄组，同一居委会居住的原则抽取正常人作为
In order to investigate the risk factors of liver cancer and the interaction between factors, a case-control survey of risk factors for hepatocellular carcinoma in Wuhan was conducted to study the synergistic effect. MATERIALS AND METHODS METHODS: A total of 353 newly diagnosed cases in 1996 were randomly selected from the reports of malignant neoplasm in Wuhan, and normal subjects were selected according to the principle of living with the same sex, same age group and same neighborhood