1. From the Joint Shantou International Eye Center, Shantou, People's Republic of China (PRC);
2. the Department of Ophthalmology, King's College Hospital, London, United Kingdom;
3. the Mingren Eye Hospital, Anxi, Fujian, PRC;
4. the Shantou University College of Medicine, Shantou, PRC;
5. the Department of Epidemiology and Public Health, Yong Loo Lin School of Medicine, National University of Singapore, Singapore;
6. From the Joint Shantou International Eye Center, Shantou, People's Republic of China (PRC); the 6Department of Ophthalmology and Visual Sciences, Chinese University of Hong Kong, Hong Kong SAR, PRC; and the 7Zhongshan Ophthalmic Center, State Key Laborato