1 Department of Gastroenterological Surgery Cancer Institute Hospital Japanese Foundation for Cancer Research Tokyo, Japan michitaka.honda@jfcr.or.jp Department of General Medicine Kurashiki Central Hospital Okayama, Japan Department of Data Science The Institute of Statistical Mathematics Tokyo, Japan Department of Gastroenterological Surgery Cancer Institute Hospital Japanese Foundation for Cancer Research Tokyo, Japan Departments of Health Promotion and Human Behavior and of Clinical Epidemiology Kyoto University Graduate School of Medicine/School of Public Health Kyoto, Japan.