1. Division of Pediatric Otolaryngology Seattle Children's Hospital Seattle Washington U.S.A.
2. Department of Otolaryngology – Head and Neck Surgery University of Washington Seattle Washington U.S.A.
3. Department of Otolaryngology – Head and Neck Surgery University of Michigan Ann Arbor Michigan U.S.A.
4. Speech and Language Services Seattle Children's Hospital Seattle Washington U.S.A.