1. Department of Oncology and Laboratory Medicine, Yamaguchi University Graduate School of Medicine, Ube, Japan
2. Division of Laboratory, Yamaguchi University Hospital, Ube, Yamaguchi, Japan
3. Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Ube, Japan
4. Department of Gastroenterology, Sentohiru Hospital, Ube, Japan
5. Department of Digestive Surgery and Surgical Oncology, Yamaguchi University Graduate School of Medicine, Ube, Japan