1. Department of Otolaryngology—Head & Neck Surgery, University of Texas Southwestern Medical Center, Dallas, Texas
2. Department of Pediatric Otolaryngology, Children’s Medical Center Dallas, Dallas, Texas
3. Division of Otolaryngology, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
4. Department of Otorhinolaryngology—Head and Neck Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania