目的研究上消化道恶性肿瘤的流行病学特征。
OBJECTIVE To study the epidemic characteristic of cancer on upper digestive.
目的了解广元地区上消化道恶性肿瘤发病情况及变化特点。
Objective To learn about the illness statuses of the upper-digestive-tract malignant tumors in Guangyuan Area.
目的了解广元地区上消化道恶性肿瘤发病情况及变化特点。
Objective To learn about the illness statuses of the upper-digestive-tract malignant tumors in Guangyuan Area.
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