The research about incidence of CHD is still in its infancy stage in Beijing, it has been only limited to pre-school children.
北京市的先心病发病率的研究还处于刚刚起步阶段，以前的研究对象也仅仅限于学龄前儿童。
The research about incidence of CHD is still in its infancy stage in Beijing, it has been only limited to pre-school children.
北京市的先心病发病率的研究还处于刚刚起步阶段，以前的研究对象也仅仅限于学龄前儿童。
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