Submitted for Publication: March 18, 2011; final revision received July 27, 2011; accepted September 4, 2011.
Author Contributions: All authors had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Park, Joo, and M.-S. Kim. Acquisition of data: Park, N.-G. Kim, and M.-S. Kim. Analysis and interpretation of data: Park, Cho, and M.-S. Kim. Drafting of the manuscript: Park, N.-G. Kim, and M.-S. Kim. Critical revision of the manuscript for important intellectual content: Park, Joo, Cho, and M.-S. Kim. Statistical analysis: Park and M.-S. Kim. Administrative, technical, and material support: M.-S. Kim. Study supervision: Joo, Cho, N.-G. Kim, and M.-S. Kim.
Financial Disclosure: None reported.
Previous Presentation: This study was presented at the American Head and Neck Society 2011 Annual Meeting; April 28, 2011; Chicago, Illinois.