1. Department of Pathology, Okayama University Medical School, Okayama, Japan.
2. Chief of the First Division of Department of Pathology, Okayama University Medical School, Okayania, Japan
3. Department of Pathology, Okayama University Medical School, Okayama, Japan
4. Okayama University Medical School, Department of Pathology, Okayama, Japan
5. Department of Pathology, Okayania University Medical School; Present Address: Ehime University, Faculty of Science, Department of Biology, Matsnyama, Ehime-ken, Japan