1. Tongren Eye Care Center, Beijing Tongren Hospital, Capital Medical University, Beijing, China
2. Beijing Institute of Ophthalmology, Beijing Tongren Hospital, Capital Medical University, Beijing, China
3. Department of Epidemiology and Biostatistics, School of Public Health, Capital Medical University, Beijing, China
4. Municipal Key Laboratory of Clinical Epidemiology, Beijing, China
5. Beijing Center for Disease Prevention and Control, Beijing, China
6. Department of Ophthalmology, Medical Faculty Mannheim of the Ruprecht-Karls-University Heidelberg, Mannheim, Germany