1. Department of Pathology and Molecular Diagnostics; Graduate School of Medical Sciences; Nagoya City University; Nagoya Japan
2. Department of Otolaryngology, Head and Neck Surgery; Graduate School of Medical Sciences; Nagoya City University; Nagoya Japan
3. Pathology Division; Shizuoka Cancer Centre; Nagaizumi Shizuoka Japan
4. Department of Head and Neck Surgery; Shizuoka Cancer Centre; Nagaizumi Shizuoka Japan
5. Department of Pathology and Molecular Diagnostics; Aichi Cancer Centre Hospital; Nagoya Japan
6. Department of Head and Neck Surgery; Aichi Cancer Centre Hospital; Nagoya Japan