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Yukinori Kurokawa has received lecture fees from Johnson and Johnson, Medtronic, Stryker and Olympus. Masanori Terashima has received lecture fees from Johnson and Johnson, Medtronic, Intuitive Surgical, Olympus, Daiichi Sankyo, Taiho Pharma, Chugai Pharma, Ono Pharma, Bristol Myers Squib, Yakult Pharma, Astellas Pharma, Eli Lilly, and Astra Zeneca. The other authors declare no conflicts of interest.","order":1,"name":"Ethics","label":"Conflict of interest","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"All procedures performed in studies involving human participants were in accordance with the Ethical Guidelines for Medical and Health Research Involving Human Subjects and with the 1964 Helsinki Declaration and its later amendments. Informed consent to be included in the study was obtained from all patients.","order":2,"name":"Ethics","label":"Ethical approval","group":{"name":"EthicsHeading","label":"Declarations"}}]}}