1 Department of Ophthalmology, The Second Hospital of Hebei Medical University, No. 215, West Heping Road, Shijiazhuang City, Hebei Province, 050000, People's Republic of China.
2 Department of Ophthalmology, The Second Hospital of Hebei Medical University, No. 215, West Heping Road, Shijiazhuang City, Hebei Province, 050000, People's Republic of China. duanjialiang@hebmu.edu.cn.