1. Department of Ophthalmology , West China Hospital, , Chengdu, Sichuan 610041 , China
2. Sichuan University , West China Hospital, , Chengdu, Sichuan 610041 , China
3. Department of Ophthalmology , West China School of Medicine, , Chengdu, Sichuan 610041 , China
4. Sichuan University , West China School of Medicine, , Chengdu, Sichuan 610041 , China