- Correspondence to Professor Liang Xu, Beijing Institute of Ophthalmology, 17 Hougou Street, Chong Wen Men, 100005 Beijing, China;
- Accepted August 23, 2009
- First published October 12, 2009.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.