1. Department of Surgery; Kyorin University School of Medicine; 6-20-2 Shinkawa, Mitaka Tokyo 181-8611 Japan
2. Department of Human Pathology; Kanazawa University School of Medicine; Kanazawa Japan
3. Department of Pathology; Shizuoka Cancer Center; Shizuoka Japan
4. Kagoshima City Hospital; Kagoshima Japan