1. Department of Ophthalmology and Visual Sciences, Faculty of Medicine The Chinese University of Hong Kong Hong Kong SAR China
2. Department of Ophthalmology and Visual Sciences Prince of Wales Hospital Hong Kong SAR China
3. Eye Centre The Chinese University of Hong Kong Medical Centre Hong Kong SAR China
4. Department of Ophthalmology, Salmaniya Medical Complex Government Hospitals Manama Bahrain
5. Hong Kong Eye Hospital Hong Kong SAR China