1. Department of Gastroenterology and Hematology, University of Toyama, Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930‑0194, Japan
2. Division of Biostatistics and Clinical Epidemiology, University of Toyama, Graduate School of Medicine, Toyama 930‑0194, Japan
3. Faculty of Health and Welfare, Kanagawa University of Human Services, Yokosuka, Kanagawa 238‑8522, Japan