研究背景及目的：恶性肿瘤发病率有逐年升高趋势，因肿瘤病故居儿童死因第二位。
Background and objective: the incidence of malignant tumors has increased gradually, which becomes the second causation of children death now.
研究背景及目的：恶性肿瘤发病率有逐年升高趋势，因肿瘤病故居儿童死因第二位。
Background and objective: the incidence of malignant tumors has increased gradually, which becomes the second causation of children death now.
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