1. Department of Pathology, National Health Insurance Cooperation Ilsan Hospital, Koyang
2. Department of Pathology, Seoul National University Children's Hospital, Seoul
3. Department of Pathology, Ajou University School of Medicine, Suwon
4. Department of General Surgery, National Health Insurance Cooperation Ilsan Hospital, Koyang
5. Department of Pathology, Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea; Department of Pathology, Yonsei University College of Medicine, Shinchon-dong 134, Seodaemoon-gu, 120-752, Seoul, Korea