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淮安居民食管癌年均死亡率为97/10万。经对当地肿瘤发病资料的初步分析,某些饮食饮水因素与食管癌发病有联系。为证实这些因
The average annual mortality rate of esophageal cancer in Huai’an residents is 97/100,000. According to the preliminary analysis of local cancer incidence data, some dietary drinking water factors have been linked to the incidence of esophageal cancer. To confirm these reasons