1. National Clinical Research Center for Geriatric Diseases Xiangya Hospital of Central South University Changsha Hunan P. R. China
2. Eye Center of Xiangya Hospital Central South University Changsha Hunan P. R. China
3. Hunan Key Laboratory of Ophthalmology Changsha Hunan P. R. China
4. Department of Ophthalmology, The Second Xiangya Hospital Central South University Changsha Hunan P. R. China
5. Hunan Clinical Research Center of Ophthalmic Disease Changsha Hunan P. R. China