1. Division of Pediatric of Otolaryngology – Head and Neck Surgery Seattle Children's Hospital Seattle Washington USA
2. Department of Otolaryngology – Head and Neck Surgery University of Washington Seattle Washington USA
3. Division of Pediatric of Otolaryngology – Head and Neck Surgery CS Mott Children's Hospital Ann Arbor Michigan USA
4. Department of Otolaryngology – Head and Neck Surgery University of Michigan Ann Arbor Michigan USA
5. Division of Otolaryngology – Head and Neck Surgery Marshall University Huntington West Virginia USA
6. Department of Otolaryngology – Head and Neck Surgery Montefiore Medical Center New York City New York USA
7. Department of Otolaryngology – Head and Neck Surgery Monroe Carell Jr. Children's Hospital at Vanderbilt University Medical Center Nashville Tennessee USA