1. Department of Internal Medicine, Nagoya University Graduate School of Medicine, Nagoya, Japan
2. Department of Pathology, Kobe University Graduate School of Medicine, Kobe, Japan
3. Department of Pathology, Kanazawa University Graduate School of Medical Science, Japan
4. Department of Internal Medicine, Shinshu University Graduate School of Medicine, Matsumoto, Japan
5. Department of Diagnostic Pathology, Shizuoka Cancer Center, Shizuoka, Japan