Xianzhi Ma

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

Huaijin Guan, Jian Ge, L. Ellwein, 2010, Ophthalmology.

Prevalence and outcomes of cataract surgery in rural China the China nine-province survey.

L. Ellwein, Z. Yin, H. Guan, 2010, Ophthalmology.