1. Guangdong Eye Institute, Department of Ophthalmology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong, China
2. Information and Statistical Center, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong, China
3. Xiamen Eye Centre of Xiamen University, Xiamen, China
4. Department of Ophthalmology, Dongguan People's Hospital, Dongguan, Guangdong, China
5. Department of Ophthalmology, Hengli Hospital, Dongguan, Guangdong, China