SIL1-near work and outdoor time and va
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下载链接：
https://doi.org/10.7910/DVN/VRJXIG
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资源简介：
Survey of 19,934 students in grade 4 and 5 from 252 randomly selected rural primary schools in Northwest China in September 2012. This survey measured visual acuity and collected self-reported data on time spent outdoors and time spent doing various types of near activities.
创建时间：
2018-10-20
