Submitted for Publication: October 23, 2012; final revision received June 22, 2013; accepted July 21, 2013.
Published Online: September 19, 2013. doi:10.1001/jamaoto.2013.4539.
Study concept and design: All authors.
Acquisition of data: All authors.
Analysis and interpretation of data: All authors.
Drafting of the manuscript: George.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: George, Wang.
Administrative, technical, or material support: All authors.
Study supervision: All authors.
Conflict of Interest Disclosures: None reported.
Previous Presentation: This study was presented at the American Head and Neck Society 2013 Annual Meeting; April 11, 2013; Orlando, Florida.
Additional Contributions: Diane Thulin, BS, and Erin Shugard, MS, of the Departments of Otolaryngology–Head and Neck Surgery and Radiation Oncology at UCSF, respectively, provided assistance in record preparation. Emily R. Nelson, MD, School of Medicine at UCSF, provided data collection assistance.
Corrections: This article was corrected online November 22, 2013, for omission of a word in the title and a typographical error in the abstract and on November 25, 2013, for a second typographical error in the abstract.