Published Online: November 28, 2011. doi:10.1001/archinternmed.2011.548
Author Contributions: Dr Unno had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Sano, Unno, and Yamamoto. Acquisition of data: Sano, Yamamoto, and Tanaka. Analysis and interpretation of data: Sano, Unno, Yamamoto, Tanaka, and Konno. Drafting of the manuscript: Sano and Unno. Critical revision of the manuscript for important intellectual content: Unno, Yamamoto, Tanaka, and Konno. Statistical analysis: Sano and Unno. Administrative, technical, and material support: Unno, Yamamoto, and Tanaka. Study supervision: Unno and Konno.
Financial Disclosure: None reported.
Funding/Support: We acknowledge the cooperation and support of the staff in the Second Department of Surgery, Hamamatsu University School of Medicine. They did not receive additional compensation for their contributions.