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Recently,the mortality of lung cancerincreasesin many areas and countries,and lung cancer is be-coming the major disease in malignant tumour re-search.Baoji city was found to be one of the citieswith high lung cancer incidence in China in early1 970 s[1] . Thereafter,intervention measures havebeen adopted,such as establishing the Environmen-tal Monitoring Station in Baoji to control the pollu-tion of land,water and air,a number of workshopsand propaganda in cancer prevention,smoking- con-tro… 相似文献
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