Accepted for Publication: March 28, 2011.
Published Online: May 16, 2011. doi:10.1001/archsurg.2011.114
Author Contributions: Study concept and design: Woo and Hyung. Acquisition of data: Hyung, Pak, Inaba, and Noh. Analysis and interpretation of data: Woo, Hyung, Pak, Inaba, Obama, and Choi. Drafting of the manuscript: Woo and Hyung. Critical revision of the manuscript for important intellectual content: Woo, Hyung, Pak, Inaba, Obama, Choi, and Noh. Statistical analysis: Inaba and Obama. Obtained funding: Hyung. Administrative, technical, and material support: Woo, Hyung, Inaba, and Noh. Study supervision: Hyung and Pak.
Financial Disclosure: None reported.
Funding/Support: This work was supported by grant 1020410 from the Korea Healthcare technology research and development project, Ministry of Health, Welfare, and Family Affairs, Republic of Korea.
Disclaimer: The Korean Ministry of Health was not involved in the design and conduct of the study; collection, management, analysis, or interpretation of the data; or preparation, review, or approval of the manuscript.