1. Department of Otolaryngology—Head and Neck Surgery Rutgers Robert Wood Johnson Medical School New Brunswick New Jersey U.S.A.
2. Division of Otolaryngology—Head and Neck Surgery, Department of Surgery University of Utah School of Medicine Salt Lake City Utah U.S.A.
3. Department of Otolaryngology—Head and Neck Surgery University of Missouri School of Medicine Columbia Missouri U.S.A.
4. Department of Otolaryngology—Head and Neck Surgery University of Iowa School of Medicine Iowa City Iowa U.S.A.
5. Department of Otolaryngology—Head and Neck Surgery University of Kansas School of Medicine Kansas City Kansas U.S.A.
6. Sanford Cancer Center Sanford Health Sioux Falls South Dakota U.S.A.
7. Department of Otolaryngology—Head and Neck Surgery and Communication Disorders University of Louisville School of Medicine Louisville Kentucky U.S.A.