1. Department of Cancer Therapy and Research, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812‑8582, Japan
2. Department of Anatomical Pathology, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812‑8582, Japan
3. Department of Otorhinolaryngology, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812‑8582, Japan
4. Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812‑8582, Japan