1. Department of Otorhinolaryngology—Head and Neck Surgery, Yokohama City University, Yokohama, Japan
2. Department of Otolaryngology, Division of Head and Neck Surgery, Stanford University, Palo Alto, California, USA
3. Department of Ear, Nose, Throat-Head and Neck Surgery, Huriez Hospital, University of Lille, Lille, France
4. Department of Surgery, Division of Head and Neck Surgery, University of California San Diego, La Jolla, California, USA