1. Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Asahikawa, Hokkaido, Japan
2. Department of Medical Laboratory and Blood Center, Asahikawa Medical University Hospital, Asahikawa, Hokkaido, Japan
3. Department of Laboratory Medicine, Asahikawa Medical University, Asahikawa, Hokkaido, Japan