1. From the Beijing Tongren Eye Center and the
2. Beijing Institute of Ophthalmology, Beijing Tongren Hospital, Capital Medical University, Beijing, China; and the
3. Beijing Institute of Ophthalmology, Beijing Tongren Hospital, Capital Medical University, Beijing, China; and the 3Department of Ophthalmology, Medical Faculty Mannheim of the Ruprecht-Karls-University, Heidelberg, Germany.