1. Department of Ophthalmology, the Second Hospital of Lanzhou University, Lanzhou, Gansu, People's Republic of China
2. Department of Ophthalmology, the 940th Hospital of Joint Service Support Forces of the Chinese People's Liberation Army, Lanzhou, Gansu, People's Republic of China
3. Cuiying Biomedical Research Center, the Second Hospital of Lanzhou University, Lanzhou, Gansu, People's Republic of China
4. Department of Pathology, Basic Medical School, Ningxia Medical University, Yinchuan, China