1. Department of Otolaryngology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States
2. Division of Pediatric Otolaryngology, Children's Hospital of Pittsburgh, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States
3. School of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States
4. Department of Otolaryngology, Children's Hospital of Pittsburgh, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States