First Clinical Academy, Guangxi Medical University, Nanning, Guangxi, China. First Clinical Academy, Guangxi Medical University, Nanning, Guangxi, China. Department of Ophthalmology, Ningbo Eye Hospital, Ningbo, Zhejiang, China. Department of Ophthalmology, Liuzhou Worker's Hospital, Liuzhou, Guangxi, China. Department of Ophthalmology, Huzhou Hospital of Traditional Chinese Medicine, Huzhou, Zhejiang, China.