Dorsal position was adopted in the first group and hugged-erect position in the second group.

第一组均采用仰卧位透视，第二组均采用抱立位透视。

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Dorsal position was adopted in the first group and hugged-erect position in the second group.

第一组均采用仰卧位透视，第二组均采用抱立位透视。

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