1. From the Department of Ophthalmology, National University of Singapore, Singapore; the2Singapore National Eye Center and Singapore Eye Research Institute, Singapore; and the
2. Singapore National Eye Center and Singapore Eye Research Institute, Singapore; and the3Department of Epidemiology, Institute of Ophthalmology, University College London, London, United Kingdom.
3. Department of Epidemiology, Institute of Ophthalmology, University College London, London, United Kingdom.
4. Singapore National Eye Center and Singapore Eye Research Institute, Singapore; and the