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[Zhonghua Yan Ke Za Zhi] Chinese Journal of Ophthalmology|December 17, 2013
[Prevalence and causes of blindness and moderate and severe visual impairment among adults aged 50 years or above in Luxi County of Yunnan Province: the China Nine-Province survey]Ning Cai, Yuan-sheng Yuan, Jia-liang Zhao, et al.Pageof 2