1. Otolaryngology—Head and Neck Surgery Service, Madigan Army Medical Center, Tacoma, Washington.
2. Department of Otolaryngology—Head and Neck Surgery, University of Washington School of Medicine, Seattle, Washington.
3. Department of Otolaryngology—Head and Neck Surgery, Oregon Health Sciences University, Portland, Oregon.
4. Department of Otolaryngology—Head and Neck Surgery, Johns Hopkins University, Baltimore, Maryland.