Study participants were seated on their mother's lap or alone with their heads stabilized by a chin and front rest.

这些研究参与者坐在他们妈妈膝上或单独用下巴和前额支托将头部固定。

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Study participants were seated on their mother's lap or alone with their heads stabilized by a chin and front rest.

这些研究参与者坐在他们妈妈膝上或单独用下巴和前额支托将头部固定。

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