1. Department of Special Education and Communication Disorders University of Nebraska‐Lincoln Lincoln Nebraska U.S.A.
2. Department of Otolaryngology ‐ Head and Neck Surgery University of Nebraska Medical Center Omaha Nebraska U.S.A.
3. Bobby R. Alford Department of Otolaryngology ‐ Head and Neck Surgery Baylor College of Medicine Houston Texas U.S.A.
4. Division of Pediatric Otolaryngology Texas Children's Hospital Houston Texas U.S.A.