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.
许多流行病学的研究都显示运动能减少肿瘤发生的风险。
Epidemiological studies report that regular physical activity can reduce the risk for cancer development.
许多流行病学的研究都显示运动能减少肿瘤发生的风险。
Epidemiological studies report that regular physical activity can reduce the risk for cancer development.
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