1. Department of Ophthalmology, Ningbo Eye Hospital, Ningbo, Zhejiang 315040, P.R. China
2. Ningbo Central Blood Center, Ningbo, Zhejiang 315040, P.R. China
3. Department of Ophthalmology, The Fourth Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong 510000, P.R. China