1. School of Public Health Sun Yat‐Sen University Guangzhou China
2. JC School of Public Health and Primary Care, Faculty of Medicine The Chinese University of Hong Kong Shatin Hong Kong SAR
3. State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center Sun Yat‐Sen University Guangzhou China
4. Guangdong‐provincial Primary Healthcare Association Guangdong China
5. School of Public Health Guangzhou Medical University Guangzhou China
6. Centre for Population Health Sciences, Usher Institute University of Edinburgh Scotland UK