1. Department of Otolaryngology–Head and Neck Surgery University of Washington Seattle Washington U.S.A.
2. Division of Pulmonary and Sleep Medicine Seattle Children's Hospital Seattle Washington U.S.A.
3. Division of Pediatric Otolaryngology–Head and Neck Surgery Seattle Children's Hospital Seattle Washington U.S.A.
4. Division of Gastroenterology and Hepatology Seattle Children's Hospital Seattle Washington U.S.A.
5. Department of Otolaryngology–Head and Neck Surgery Vanderbilt University Nashville Tennessee U.S.A.
6. Speech and Language Services Seattle Children's Hospital Seattle Washington U.S.A.