Submitted for Publication: October 31, 2012; final revision received December 13, 2012; accepted December 27, 2012.
Published Online: March 21, 2013. doi:10.1001/jamaoto.2013.46
Author Contributions: Drs Su, Chen, Chuang, Guo, Lin, Luo, Fang, and Chien 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. Drs Su and Chen contributed equally to this work. Study concept and design: Chien. Acquisition of data: Chuang, Guo, Lin, and Luo. Analysis and interpretation of data: Su, Chen, and Fang. Drafting of the manuscript: Chen, Chuang, Guo, Lin, Luo, and Fang. Critical revision of the manuscript for important intellectual content: Su and Chien. Statistical analysis: Chen, Chuang, Guo, Luo, and Fang. Obtained funding: Su, Guo, and Luo. Administrative, technical, and material support: Su, Chen, Lin, and Chien. Study supervision: Chuang and Chien.
Conflict of Interest Disclosures: None reported.
Previous Presentation: This study was presented at the American Head and Neck Society Eighth International Conference on Head and Neck Surgery; July 21, 2012; Toronto, Ontario, Canada.
Additional Contributions: We thank the staff members of the Kaohsiung Chang Gung Memorial Hospital Head and Neck Cancer Registry.