1 Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Tongren Hospital, Capital Medical University, Beijing, China.
2 Hong Kong Eye Hospital, Department of Ophthalmology & Visual Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong. tyylai@cuhk.edu.hk.
3 2010 Macula & Retina Centre, Kowloon, Hong Kong. tyylai@cuhk.edu.hk.