1. Department of Otolaryngology ‐ Head and Neck Surgery University of Washington Medical Center Seattle Washington U.S.A.
2. Department of Otolaryngology Head and Neck Surgery University of Kanas School of Medicine Kansas City Kansas U.S.A.
3. Department of Otolaryngology‐Head and Neck Surgery Harvard Medical School Boston Massachusetts U.S.A.
4. Department of Otolaryngology‐Head and Neck Surgery University of Texas Southwestern Medical Center Dallas Texas U.S.A.
5. Department of Surgery ‐ Otolaryngology/Head & Neck Surgery University of California, San Diego San Diego California U.S.A.