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Prevalence of vision impairment in older adults in rural China: the China Nine-Province Survey

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General Info
Geography 
China (CHN)
Beijing, Chongqing, Guangdong, Hebei, Heilongjiang, Jiangsu, Jiangxi, Xinjiang, Yunnan
Coverage type 
Subnational
Time period covered 
01/2007 - 12/2007