Association of outdoor activity with myopia among lower-grade primary school students in Guangzhou city: a follow-up study
ObjectiveTo explore the effect of outdoor activity time on myopia among lower-grade primary school students in Guangzhou city and to provide evidences for myopia prevention among children. MethodsUsing cluster random sampling，we conducted a baseline survey among 3 171 first and second grade students...
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Editorial Office of Chinese Journal of Public Health,
2022-06-01T00:00:00Z.
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