1. 1st Department of Pathology, Kanazawa Medical University, Uchinada, Ishikawa 920—0293, Japan
2. lst Department of Pathology, Gifu University School of Medicine, 40 Tsukasa-machi, Gifu 500—8705, Japan
3. Faculty of Pharmaceutical Sciences, Hokkaido Iryo University, Ishikari-Tobetsu, Hokkaido 061—0293, Japan