Accepted for Publication: August 30, 2011.
Author Contributions: Dr Li, Mr Qian, and Dr Zhang contributed equally to the article. Study concept and design: Li and Shi. Acquisition of data: Li, Qian, Bai, Song, Hong, Jia, Zhang, and Shi. Analysis and interpretation of data: Li, Qian, and Zhang. Drafting of the manuscript: Li, Qian, Bai, Song, Hong, and Jia. Critical revision of the manuscript for important intellectual content: Zhang and Shi. Statistical analysis: Li, Qian, Bai, Song, and Hong. Study supervision: Zhang and Shi.
Financial Disclosure: None reported.
Additional Contributions: Bing Ma, MD, Department of General Surgery, 301 Hospital of PLA, provided technical assistance.
This article was corrected for errors on March 6, 2012.