1. Department of Otolaryngology–Head and Neck Surgery University of South Florida Tampa Florida U.S.A.
2. Department of Otolaryngology–Head and Neck Surgery University of Southern California Los Angeles California U.S.A.
3. Department of Otolaryngology–Head and Neck Surgery Oregon Health & Science University Portland Oregon U.S.A.
4. Department of Otolaryngology–Head and Neck Surgery University of Washington Seattle Washington U.S.A.
5. Department of Otolaryngology–Head and Neck Surgery New York Medical College Valhalla New York U.S.A.
6. Department of Otolaryngology–Head and Neck Surgery Cleveland Clinic Cleveland Ohio U.S.A.