Accepted for Publication: September 6, 2011.
Published Online: November 14, 2011. doi:10.1001/archneurol.2011.1930
Author Contributions:Study concept and design: Choi, S. H. Kim, Son, and Jang. Acquisition of data: Choi, O. L. Kim, Ahn, Cho, Son, and Jang. Analysis and interpretation of data: Choi, S. H. Kim, and Jang. Drafting of the manuscript: Choi, O. L. Kim, S H. Kim, and Jang. Critical revision of the manuscript for important intellectual content: Ahn, Cho, Son, and Jang. Statistical analysis: Choi, O. L. Kim, S. H. Kim, Cho, Son, and Jang. Obtained funding: Ahn and Jang. Administrative, technical, and material support: Choi, O. L. Kim, S. H. Kim, Ahn, Cho, Son, and Jang. Study supervision: Jang.
Financial Disclosure: None reported.
Funding/Support: This work was supported by National Research Foundation of Korea Grant funded by the Korean Government (KRF-2008-314-E00173).