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Did you mean yan yan (2,469 results)?
[A 5 year surveillance of blindness in Yilong Commune, Yian County, Heilongjiang Province].
Yu ZH, Wei ZX. Yu ZH, et al. Zhonghua Yan Ke Za Zhi. 1993 Jan;29(1):49-51. Zhonghua Yan Ke Za Zhi. 1993. PMID: 8334913 Chinese.
A sample of 35,404 people in Yilong Commune, Yian County, Heilongjiang Province, has been under surveillance since 1985 when the primary eye care system was established. ...
A sample of 35,404 people in Yilong Commune, Yian County, Heilongjiang Province, has been under surveillance since 1985 when the prim …