Affiliation: | a Department of Gastroenterological Surgery, Gastroenterological Center, Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan b Showa General Hospital, Tokyo, Japan c Department of Gastroenterology, Kyoto Second Red Cross Hospital, Kyoto, Japan d Department of Gastrointestinal Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases, Osaka, Japan e Department of Gastroenterology, JR West Osaka General Hospital, Osaka, Japan f Department of Gastroenterology, Kanto Medical Center, NTT East, Tokyo, Japan g Hiratsuka Gastroenterological Hospital, Tokyo, Japan h Department of Gastroenterology, Saiseikai Kawaguchi General Hospital, Saitama, Japan i Department of Gastrointestinal Surgery, Graduate School of Medicine, University of Tokyo, Tokyo, Japan j Division for Research and Development of Minor Invasive Treatment, Tumor Center, Keio University School of Medicine, Tokyo, Japan k Division of Gastroenterology and Hepatology, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan l Jikei University School of Medicine, Tokyo, Japan |