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.

youdao

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.

youdao