1. Department of Gastroenterology and Hepatology Yokohama City University Graduate School of Medicine Yokohama Japan
2. Gastroenterology Division National Hospital Organization Yokohama Medical Center Yokohama Japan
3. Department of Gastroenterology Shin‐yurigaoka General Hospital Kawasaki Japan
4. Department of Data Science Yokohama City University School of Data Science Yokohama Japan
5. Laboratory of Physiology Yokohama City University Hospital Yokohama Japan