1. Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong
2. Department of Ophthalmology, Caritas Medical Centre, Hong Kong
3. Medical Retina Service, Singapore National Eye Centre, Singapore 4Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
4. Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong 5Department of Ophthalmology, Prince of Wales Hospital, Hong Kong