1. Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences Niigata University Niigata Japan
2. Medical Laboratory Division Niigata University Medical and Dental Hospital Niigata Japan
3. Division of Radiology, Department of Clinical Technology Niigata University Medical and Dental Hospital Niigata Japan
4. Department of Radiology and Radiation Oncology Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
5. Bioscience Division TOSOH Corporation Ayase‐shi Japan