1. Department of Otorhinolaryngology, Nagoya University Graduate School of Medicine, Nagoya, Japan;
2. Department of Otorhinolaryngology, The First Affiliated Hospital of China Medical University, Otorhinolaryngology, Shenyang, China;
3. Department of Otorhinolaryngology, Nagoya Univerisity Hospital, Nagoya, Japan;
4. Department of Radiology, Nagoya University, Graduate School of Medicine, Nagoya, Japan