1. Department of Otolaryngology—Head & Neck Surgery University of North Carolina School of Medicine Chapel Hill North Carolina USA
2. Department of Otolaryngology—Head & Neck Surgery West Virginia University School of Medicine Morgantown West Virginia USA
3. Department of Otolaryngology—Head & Neck Surgery Medical University of South Carolina Charleston South Carolina USA
4. Department of Otolaryngology—Head & Neck Surgery Weill Cornell Medical College New York New York USA
5. Department of Otolaryngology—Head & Neck Surgery Baylor College of Medicine Houston Texas USA
6. Department of Otolaryngology—Head & Neck Surgery Columbia University School of Medicine New York New York USA