- Correspondence to Professor Chi Pui Pang, Department of Ophthalmology & Visual Sciences, The Chinese University of Hong Kong, Hong Kong Eye Hospital, 147K Argyle Street, Kowloon, Hong Kong, China;
- Received May 6, 2013
- Revised June 19, 2013
- Accepted July 27, 2013
- First published August 21, 2013.
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