1. The Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
2. Department of Ophthalmology, The University of Hong Kong, Hong Kong, China
3. Department of Ophthalmology, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China
4. Beijing Institute of Ophthalmology, Beijing Ophthalmology and Visual Sciences Key Laboratory, Beijing Tongren Hospital, Capital Medical University, Beijing, China
5. Department of Ophthalmology, Medical Faculty Mannheim of the Ruprecht-Karls-University Heidelberg, Mannheim, Germany