1. S. Hirota, K. Hashimoto, G. M. Tunio, Y. Kitamura, Department of Pathology, Osaka University Medical School, Yamada-oka 2-2, Suita 565, Japan.
2. K. Isozaki, Y. Moriyama, Y. Matsuzawa, Y. Shinomura, Department of Internal Medicine II, Osaka University Medical School, Yamada-oka 2-2, Suita 565, Japan.
3. T. Nishida, Department of Surgery I, Osaka University Medical School, Yamada-oka 2-2, Suita 565, Japan.
4. S. Ishiguro, Division of Pathology, Osaka Medical Center for Cancer and Cardiovascular Diseases, Osaka, Japan.
5. K. Kawano, Division of Pathology, Osaka Rosai Hospital, Sakai, Japan.