1. The Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia, China.
2. Department of Ophthalmology, People's Hospital, Peking University, and Key Laboratory of Vision Loss and Restoration, Ministry of Education, Beijing, China
3. Department of Ophthalmology, University of Hong Kong, Hong Kong, China.
4. Department of Ophthalmology, Medical Faculty Mannheim of the Ruprecht-Karls-University, Heidelberg, Germany.