1. Department of Otorhinolaryngology; National Center for Geriatrics and Gerontology; Obu Japan
2. Department of Otorhinolaryngology; Graduate School of Medicine; Nagoya University; Nagoya Japan
3. Department of Radiology; Graduate School of Medicine; Nagoya University; Nagoya Japan
4. Department of Otorhinolaryngology; Kamiiida Daiichi General Hospital; Nagoya Japan
5. Department of Radiology; National Center for Geriatrics and Gerontology; Obu Japan
6. Center for Comprehensive Care and Research on Memory Disorders; National Center for Geriatrics and Gerontology; Obu Japan
7. Department of Otorhinolaryngology; Aichi Medical University; Nagakute Japan