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Footnotes
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Contributors YH contributed to the analysis, interpretation of data and drafting the article. JL, XZ, and YH contributed to the acquisition of data and revising the article. LX made substantial contributions to the conception and design, analysis and interpretation of data, and revising the article. All of the authors approved the final version of the manuscript for publication.
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Funding This work was supported by grants from the National 11th Five-Year Science and Technology Supporting Projects (2006BAI02B04, the Ministry of Science and Technology of the People's Republic of China) and the National Natural Science Foundation of China (30600698).
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Competing interests None.
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Patient consent Obtained.
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Ethics approval Ethics approval was received from the Ethics Committee of Shandong Eye Institute.
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Provenance and peer review Not commissioned; externally peer reviewed.