1. Division of Pediatric Otolaryngology-Head and Neck Surgery, Children's Hospital and Regional Medical Center, Seattle, Washington.
2. Department of Otolaryngology-Head and Neck Surgery, University of Washington, Seattle, Washington.
3. Department of Pathology, University of Washington, Seattle, Washington.
4. Department of Otolaryngology-Head and Neck Surgery, University of California, Irvine, California.
5. Department of Otolaryngology, Madigan Army Medical Center, Tacoma, Washington.