1. Department of Ophthalmology, Tung Wah Eastern Hospital, Causeway Bay, Hong Kong
2. Department of Ophthalmology, Caritas Medical Centre, Shamshuipo, Hong Kong
3. Hong Kong Eye Hospital, Kowloon, Hong Kong
4. Department of Ophthalmology & Visual Sciences, Prince of Wales Hospital, Hong Kong
5. Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong