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Objective Ci-xian County is located in the north of China and is a high-risk area for esophageal cancer (EC). In 2004, the incidence rate of EC in the county was 127/100,000 and 93/100,000 in the male and female population, respectively, and that of gastric cancer (GC) was 72/100,000 and 36/100,000. Since 2001 a cohort screening, supported by a special national fund, utilizing endoscopic examination...
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