1. Department of Otolaryngology-Head and Neck Surgery, University of Colorado, Aurora, Colorado, USA.
2. Department of Public Health Sciences, University of Virginia, Charlottesville, Virginia, USA.
3. Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, Iowa, USA.
4. Department of Otolaryngology-Head and Neck Surgery, University of Virginia, Charlottesville, Virginia, USA.