1. Department of Pathology, National Hospital Organization Nagasaki Medical Center Nagasaki Japan
2. Department of Head and Neck Surgery, National Hospital Organization Nagasaki Medical Center Nagasaki Japan
3. Department of Radiology, National Hospital Organization Nagasaki Medical Center Nagasaki Japan
4. Department of Radiological Sciences, Graduate School of Biomedical Sciences Nagasaki University School of Medicine Nagasaki Japan
5. Department of Hematology Nagasaki Prefectural Shimabara Hospital Nagasaki Japan
6. Department of Pathology, Faculty of Medicine Yamagata University Yamagata Japan