1. Department of Gastroenterology, Endoscopy Division, National Cancer Center Hospital East, Kashiwa, Japan
2. Department of Clinical Oncology, Kyoto University Graduate School of Medicine, Kyoto, Japan
3. Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
4. Pathology Division, Research Center for Innovative Oncology, National Cancer Center, Kashiwa, Japan
5. Department of Laboratory Medicine, Shinshu University Hospital, Nagano, Japan
6. Department of Head and Neck Surgery, National Cancer Center Hospital East, Kashiwa, Japan