1. Department of Otolaryngology-Head and Neck Surgery; Nationwide Children's Hospital and Wexner Medical Center at Ohio State University; Columbus Ohio U.S.A.
2. Intertek Product Intelligence Group; Oak Brook Illinois U.S.A.
3. Division of Otolaryngology; Children's Hospital of Philadelphia; Philadelphia Pennsylvania U.S.A.
4. Department of Otorhinolaryngology-Head and Neck Surgery; Perelman School of Medicine at the University of Pennsylvania; Philadelphia Pennsylvania U.S.A.