1. Department of Gastroenterology; Yokohama City University School of Medicine; Yokohama Japan
2. Department of Molecular Oncology Graduate School of Medicine; Chiba University; Chiba Japan
3. Department of Gastroenterology; Kanto Medical Center, NTT East; Tokyo Japan
4. Department of Diagnostic Pathology; Kanto Medical Center, NTT East; Tokyo Japan
5. Genome Science Division Research Center for Advanced Science and Technology; The University of Tokyo; Tokyo Japan
6. CREST; Japan Science and Technology Agency; Saitama Japan