[1] Shantou Univ, Joint Shantou Int Eye Ctr, Shantou 515041, Guangdong, Peoples R China
[2] Chinese Univ Hong Kong, Shantou, Peoples R China
[3] Chinese Univ Hong Kong, Dept Ophthalmol & Visual Sci, Hong Kong, Hong Kong, Peoples R China
[4] Zhongshan Ophthalm Ctr, State Key Lab, Guangzhou, Guangdong, Peoples R China