1. Department of Otolaryngology-Head and Neck Surgery, Aichi Gakuin University School of Dentistry, Nagoya City, Japan
2. Inagaki ENT Clinic, Toyohashi City, Japan
3. Department of Neurosurgery, Nagoya City University East Medical Centre, Nagoya City, Japan
4. Department of Otolaryngology-Head and Neck Surgery, Nagoya City University East Medical Centre, Nagoya City, Japan