1. Department of Gastroenterology and Hepatology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki 852-8501, Japan
2. Department of Histology and Cell Biology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki 852-8523, Japan
3. Department of Rheumatology, National Hospital Organization Ureshino Medical Center, Saga 843-0393, Japan
4. Medical Education Development Center, Nagasaki University Hospital, Nagasaki 852-8501, Japan
5. Department of Tumor and Diagnostic Pathology, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki 852-8523, Japan
6. Department of Otolaryngology, Head and Neck Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki 852-8501, Japan
7. Department of Gastroenterology, Sasebo City General Hospital, Nagasaki 857-8511, Japan