1. Division of Otolaryngology – Head and Neck Surgery The George Washington University School of Medicine and Health Sciences Washington District of Columbia U.S.A.
2. Department of Otolaryngology – Head and Neck Surgery Weill Cornell Medical College New York New York U.S.A.
3. Department of Otolaryngology – Head and Neck Surgery Columbia University College of Physicians and Surgeons New York New York U.S.A.
4. School of Medicine University of Texas Rio Grande Valley Edinburg Texas U.S.A.
5. Department of Head and Neck Surgery University of Texas MD Anderson Cancer Center Houston Texas U.S.A.
6. Department of Otolaryngology – Head and Neck Surgery Oregon Health and Science University Portland Oregon U.S.A.
7. Birmingham Heartlands Hospital Birmingham United Kingdom
8. Good Hope Hospital Sutton Coldfield United Kingdom
9. Department of Otolaryngology and Communication Sciences Medical College of Wisconsin Milwaukee Wisconsin U.S.A.