1 King's Population Health Institute, King's College London, London SE1 1UL, UK; King's Health Partners, London, UK; Yong Loo Lin School of Medicine, National University of Singapore, Singapore. Electronic address: josip.car@kcl.ac.uk.
2 Beijing Visual Science and Translational Eye Research Institute (BERI), Beijing Tsinghua Changgung Hospital Eye Center, Tsinghua Medicine, Tsinghua University, Beijing, China; School of Biomedical Engineering, Tsinghua Medicine, Tsinghua University, Beijing, China; Singapore Eye Research Institute, Singapore National Eye Centre, Singapore.
3 Harvard T H Chan School of Public Health, Harvard University, Boston, MA, USA; Harvard Medical School, Harvard University, Boston, MA, USA.