- Correspondence to: Lixin Xie, Shandong Eye Institute, 5 Yanerdao Road, Qingdao, 266071, China;
- Received 19 November 2008
- Accepted 11 October 2009
- Published in print 1 January 2009.
- Published online 3 December 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.