Institution: | Yan-Kun Zhang, Yan Guan, Department of Ophthalmology, Hebei Chest Hospital, Shijiazhuang 050047, Hebei Province, ChinaJuan Zhao, Department of Respiratory, Hebei Chest Hospital, Shijiazhuang 050047, Hebei Province, ChinaLi-Fei Wang, Department of Ophthalmology, Hebei Eye Hospital, Xingtai 050010, Hebei Province, China |