1. Department of Otolaryngology Head and Neck Surgery Columbia University Irving Medical Center New York New York U.S.A.
2. Department of Otolaryngology Head and Neck Surgery Oregon Health & Science University Portland Oregon U.S.A.
3. Department of Otolaryngology Head and Neck Surgery The University of Oklahoma Health Sciences Center Oklahoma City Oklahoma U.S.A.
4. Department of Otolaryngology Head and Neck Surgery Cleveland Clinic Foundation Cleveland Ohio U.S.A.