1. Department of Otorhinolaryngology, Nagoya University Graduate School of Medicine, Nagoya, Japan
2. Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Japan
3. Department of Health and Nutrition, Nagoya Women’s Univerisity, Nagoya, Japan
4. Department of Radiology, Nagoya University Graduate School of Medicine, Nagoya, Japan