"We know that it is a risk factor but we can't attribute the rise in autism to the shifting trend towards having children later in life."

VOA: standard.2010.02.10

Well, there are many factors, but one important factor is, the rise of the Internet has competed with -people used to buy The Wall Street Journal to get data like this.

其实有很多因素,但是最主要一点是,来自网络的竞争,人们过去买《华尔街日报》来获取这些数据

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