Since 1973 combined prophylactic measures against esophageal cancer were carried out in Ci-Xian county, Hebei province, an area of high incidence of esophageal can- cer.
食管癌高发区磁县，自1973年以来采取综合性预防措施后，食管癌的发生与死亡率均有逐年下降趋势。
Since 1973 combined prophylactic measures against esophageal cancer were carried out in Ci-Xian county, Hebei province, an area of high incidence of esophageal can- cer.
食管癌高发区磁县，自1973年以来采取综合性预防措施后，食管癌的发生与死亡率均有逐年下降趋势。
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