参考文献

[1] LI SM, LI H, LI SY, et al. Time outdoors and myopia progression over 2 years in Chinese children: the Anyang Childhood Eye Study [J]. Investigative ophthalmology & visual science, 2015, 56（8）: 4734-4740.

[2] LI SM, LIU LR, LI SY, et al. Design, methodology and baseline data of a school-based cohort study in central China: the Anyang Childhood Eye Study[J]. Ophthalmic epidemiology, 2013, 20（6）: 348-359.