1. Singapore Eye Research Institute, Singapore National Eye Centre, Eye ACP Duke-NUS Medical School, Singapore 169856, Singapore
2. Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 636921, Singapore
3. Johnson & Johnson Vision, Jacksonville, FL 32256, USA
4. Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119228, Singapore
5. Department of Ophthalmology, Columbia University, New York, NY 10032, USA