Accepted for Publication: September 21, 2011.
Author Contributions:Study concept and design: Burlew and Barnett. Acquisition of data: Yi and Barnett. Analysis and interpretation of data: Yi, Burlew, Barnett, and Moore. Drafting of the manuscript: Yi and Burlew. Critical revision of the manuscript for important intellectual content: Yi, Burlew, Barnett, and Moore. Administrative, technical, and material support: Burlew, Barnett, and Moore. Study supervision: Burlew and Barnett.
Financial Disclosure: None reported.