1. Department of Otolaryngology—Head and Neck Surgery University of Nevada Nevada Las Vegas USA
2. Department of Surgery University of Washington Medical Center Seattle Washington USA
3. Department of Otolaryngology—Head and Neck Surgery Vanderbilt University Medical Center Nashville Tennessee USA
4. Department of Otolaryngology—Head and Neck Surgery University of Texas Medical Branch at Galveston Galveston Texas USA
5. John A. Burns School of Medicine University of Hawaii at Manoa Honolulu Hawaii USA
6. Department of Otolaryngology—Head and Neck Surgery, Tripler Army Medical Center Honolulu Hawaii USA
7. Department of Otolaryngology—Head and Neck Surgery University of California Davis California USA