1. Department of Gastrointestinal Oncology Osaka International Cancer Institute Osaka Japan
2. Department of Gastroenterology Okayama University Hospital Okayama Japan
3. Cancer Control Center Osaka International Cancer Institute Osaka Japan
4. Department of Medical Informatics Osaka International Cancer Institute Osaka Japan
5. Division of Health Science, Graduate School of Medicine Osaka University Osaka Japan
6. Division of Environmental Medicine and Population Sciences, Department of Social Medicine, Graduate School of Medicine Osaka University Osaka Japan