1. Department of Otolaryngology‐Head and Neck Surgery Johns Hopkins University School of Medicine Baltimore Maryland U.S.A.
2. Department of Otolaryngology & Communication State University of New York Upstate Medical University Syracuse New York U.S.A.
3. Department of Otorhinolaryngology‐Head and Neck Surgery Mayo Clinic Rochester Minnesota U.S.A.
4. Department of Otolaryngology Vanderbilt University School of Medicine Nashville Tennessee U.S.A.
5. The North American Airway Collaborative U.S.A.