1. Centre for Public Health, Queen’s University Belfast, Belfast BT12 6BA, UK
2. Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119228
3. Health Outcomes Research, Department of Pharmaceutical Systems and Policy, West Virginia University, Morgantown, WV 26505, USA
4. State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou 510275, China
5. Singapore Eye Research Institute, Singapore 169856
6. Office of Clinical Sciences, Duke-NUS Graduate Medical School, Singapore 168751