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Christodoulidis G, Zacharoulis D, Barbanis S, Katsogridakis E, Hatzitheofilou K. Heterotopic pancreas in the stomach: a case report and literature review. World J Gastroenterol 13: 6098-6100, 2007.","DOI":"10.3748\/wjg.v13.45.6098"},{"key":"13","doi-asserted-by":"crossref","unstructured":"13. Watanabe W, Kurumada T, Shirai T, Tsutsumi Y. Aberrant insulinoma of the duodenal bulb. Pathol Int 45: 895-900, 1995.","DOI":"10.1111\/j.1440-1827.1995.tb03413.x"},{"key":"14","doi-asserted-by":"crossref","unstructured":"14. Lee DW, Kim MK, Kim HG. Diagnosis of pancreatic neuroendocrine tumors. Clin Endosc 50: 537-545, 2017.","DOI":"10.5946\/ce.2017.131"},{"key":"15","doi-asserted-by":"crossref","unstructured":"15. Nikfarjam M, Warshaw AL, Axelrod L, et al. Improved contemporary surgical management of insulinomas: a 25-year experience at the Massachusetts General Hospital. 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