1. Department of Ophtalmology, Inner Mongolia Chaoju Eye Hospital, Hohhot, Inner Mongolia, People’s Republic of China
2. Department of Ophtalmology, Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia, People’s Republic of China
3. The First Affiliated Hospital of Chongqing Medical University, Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, Chongqing Branch of National Clinical Research Center for Ocular Diseases, Chongqing, P. R. China