1. Tissue Engineering and Stem Cell Group, Singapore Eye Research Institute, Singapore;
2. Ophthalmology and Visual Sciences Academic Clinical Program, Duke-NUS Medical School, Singapore;
3. Epidemiology Group, Singapore Eye Research Institute, Singapore;
4. Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore and National University Health System, Singapore, Singapore;
5. Department of Cornea and External Eye Disease, Singapore National Eye Centre, Singapore; and
6. Department of Ophthalmology, National Taiwan University Hospital, Taipei, Taiwan.