1. Department of Pathology Tsuchiura Kyodo General Hospital Ibaraki Japan
2. Division of Pathology, Exploratory Oncology Research and Clinical Trial Center National Cancer Center Chiba Japan
3. Department of Pathology Fukuoka University Fukuoka Japan
4. Department of Cardiovascular Surgery, Faculty of Medicine University of Tsukuba Ibaraki Japan
5. Department of Diagnostic Pathology, Faculty of Medicine University of Tsukuba Ibaraki Japan