There was an error in the funding statement. The correct funding statement is: "This research was supported by grant No. 30973246 (W.Z.C.) from the National Natural Science Foundation of China (http://www.nsfc.gov.cn); [^] grant No. 2009A030200004 (W.Z.C.) from the Science and Technology Planning Project of Guangdong Province, China (http://www.gdstc.gov.cn); [^] grant No. B2011106 (W.P.X.) from the Medical Science Foundation of Guangdong Province (http://www.gdwst.gov.cn); [^] grant No. S2011040004327 (W.P.X.) from the Doctor Initiating Project of the National Science Foundation of Guangdong Province; and the Fundamental Research Funds of the State Key Laboratory of Ophthalmology. The funders had no role in the study design, data collection and analysis, decision to publish, or preparation of this manuscript."
Footnotes
Competing Interests: No competing interests declared.
