1. Department of Diagnostic Pathology; Kyoto University Hospital, 54 Shogoin-Kawaharacho; Sakyo-ku Kyoto 606-8397 Japan
2. Center for Anatomical, Pathological; Forensic Medical Research; Graduate School of Medicine; Kyoto University, Yoshida Konoe-cho; Sakyo-ku Kyoto 606-8501 Japan
3. Department of Pathology and Biology of Diseases; Graduate School of Medicine; Kyoto University, Yoshida Konoe-cho; Sakyo-ku Kyoto 606-8501 Japan
4. Cancer Institute; Laboratory of Carcinogenesis, Ariake 3-8021; Koto-ku Tokyo 135-8550 Japan