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0-5岁。这些数字也是反推,但文献意见比较统一。如果延伸到“儿童”(0-9岁),数字更高。有文献给出数字是:0-1岁,25%; 1-4岁,12.5%,5-9岁,6%

coolients (苦丁山)
(#11063690@0)
2017-9-21 -04:00
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