1. Department of Diagnostic Pathology; Shizuoka Cancer Center; Sunto-Nagaizumi 1007 Shizuoka 411-8777 Japan
2. Department of Pathology; Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul Korea
3. Department of Pathology; Jichi Medical University; Tochigi Japan
4. Department of Histopathology; Tohoku University Graduate School of Medicine; Sendai Japan
5. Department of Pathology; Asan Medical Center; University of Ulsan College of Medicine; Seoul Korea
6. Department of Pathology; Seoul National University Hospital; Seoul Korea
7. Department of Diagnostic Pathology; Kobe University Graduate School of Medicine; Kobe Japan
8. Department of Surgery; Seoul National University Hospital; Seoul Korea
9. Second Department of Surgery; Dokkyo Medical University; Tochigi Japan