- Professor, Department of Gastroenterology and Hepatology, Faculty of Medicine, Toho University, Tokyo
- Professor, Division of Gastroenterology and Hepatology, Toho University Omori Medical Center, Tokyo
- Board Member of Directors of the Japanese Society of Gastrointestinal Cancer Screening (JSGCS)
- Councilor of the Japan Gastroenterological Endoscopy Society (JGES)
- Councilor of the Japanese Gastroenterological Association (JGA)
- Councilor of the Japan Society of Colon Examination
- Councilor of the Japanese Association for Cancer Prevention
- Member of the Future Planning Committee of the Japan Digestive Disease Week (JDDW)
- Principal investigator of the Japan Polyp Study
- Principal investigator of the Niijima/Oshima Study
- Chairman of the Endoscopy Screening Certification Program Committee (JGES)
- Chairman of the Colorectal Cancer Screening Quality Control Committee (JSGCS)
- 東邦大学医学部内科学講座 消化器内科学分野 主任教授
- 東邦大学医療センター大森病院 消化器内科 教授
- 日本消化器がん検診学会 理事
- 日本消化器内視鏡学会 学術評議員
- 日本消化管学会 代議員
- 日本大腸検査学会 評議員
- 日本がん予防学会 評議員
- 日本消化器関連学会機構：将来構想委員会 委員
- Japan Polyp Study 主任研究者
- 新島・大島研究 主任研究者
- 日本消化器内視鏡学会 内視鏡スクリーニング認定医制度委員会 委員長
- 日本消化器がん検診学会 大腸がん検診精度管理委員会 委員長
- Department of Gastroenterology and Hepatology, Faculty of Medicine, Toho University
- M.D, Yamagata University, School of Medicine
- Ph.D, Dokkyo Medical University
- Intern at Yamagata Pref. Central Hospital, Internal Medicine
- Resident at Department of Gastroenterology and Endoscopy, National Cancer Center Hospital, Tokyo, Japan
- Chief Resident at Department of Gastroenterology and Endoscopy, National Cancer Center Hospital, Tokyo, Japan
- Staff of Endoscopy Division, National Cancer Center Hospital, Tokyo, Japan
- Head of Endoscopy Division, National Cancer Center Hospital, Tokyo, Japan
- Chief of Cancer Screening Division Research Center for Cancer Prevention and Screening National Cancer Center
- Director of Cancer Screening Center, National Cancer Center Hospital, Tokyo, Japan
- Chief of Division of Screening Technology and System Development, Center for Public Health Sciences, National Cancer Center, Tokyo, Japan
- Professor, Department of Gastroenterology and Hepatology, Faculty of Medicine, Toho University, Tokyo, Japan
- Division of Gastroenterology and Hepatology, Toho University Omori Medical Center, Tokyo, Japan
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