1. From the Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University; Beijing Ophthalmology & Visual Science Key Lab, Beijing, China;
2. Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland; 3Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland;
3. Handan Eye Hospital, Handan City, Hebei Province, China; and
4. Shenzheng Eye Hospital, Shenzheng, Guangdong Province, China.