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Ito T, Masui T, Komoto I, <i>et al.<\/i> JNETS clinical practice guidelines for gastroenteropancreatic neuroendocrine neoplasms:diagnosis, treatment, and follow-up:a synopsis. J Gastroenterol, <b>56<\/b>:1033-1044, 2021.","DOI":"10.1007\/s00535-021-01827-7"},{"key":"9","doi-asserted-by":"crossref","unstructured":"9. Moon CM, Huh KC, Jung SA, <i>et al.<\/i> Long-term clinical outcomes of rectal neuroendocrine tumors according to the pathologic status after initial endoscopic resection:a kasid multicenter study. Am J Gastroenterol, <b>111<\/b>:1276-1285, 2016.","DOI":"10.1038\/ajg.2016.267"},{"key":"10","doi-asserted-by":"crossref","unstructured":"10. Hane Y, Tsuchikawa T, Tanaka K,<i>et al.<\/i> Metachronous liver metastases after long-term follow-up of endoscopic resection for rectal neuroendocrine neoplasms:a report of three cases. Surgical Case Reports, <b>6<\/b>:22, 2020.","DOI":"10.1186\/s40792-020-0792-5"},{"key":"11","doi-asserted-by":"crossref","unstructured":"11. Hamada Y, Tameda M, Nakagawa H. Metachronous liver metastasis during long-term follow-up after endoscopic submucosal dissection of a small rectal neuroendocrine neoplasm. Intern Med, <b>64<\/b>:2323-2327, 2025.","DOI":"10.2169\/internalmedicine.4849-24"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12. Pasquali C, Rubello D, Sperti C,<i>et al.<\/i> Neuroendocrine tumor imaging:can 18F-fluorodeoxyglucose positron emission tomography detect tumors with poor prognosis and aggressive behavior? World J Surg, <b>22<\/b>:588-592, 1998.","DOI":"10.1007\/s002689900439"},{"key":"13","doi-asserted-by":"crossref","unstructured":"13. Rinke A, M\u00fcller HH, Schade-Brittinger C, <i>et al.<\/i>Placebo-controlled, double-blind, prospective, randomized study on the effect of octreotide LAR in the control of tumor growth in patients with metastatic neuroendocrine midgut tumors:a report from the PROMID Study Group. 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