1. The Gastrointestinal Pathology Study Group, Seoul, Korea.
2. Department of Pathology, Seoul St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea.
3. Department of Pathology, Inje University Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea.
4. The Cancer Registration Committee of the Korean Society of Pathologists, Seoul, Korea.
5. Department of Pathology, Yonsei University Wonju College of Medicine, Wonju, Korea.
6. Department of Pathology, Inha University Hospital, Inha University Scool of Medicine, Incheon, Korea.
7. Department of Pathology, Dankook University Hospital, Dankook University College of Medicine, Cheonan, Korea.
8. Department of Pathology, Seoul National University, Seoul, Korea.
9. Department of Pathology, Korea Cancer Center Hospital, Seoul, Korea.
10. Department of Pathology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
11. Department of Pathology, Soon Chun Hyang University Seoul Hospital, Soon Chun Hyang University College of Medicine, Seoul, Korea.