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Portal annular pancreas: a systematic review of a clinical challenge. Pancreas 2014; 43: 981\u20136.","DOI":"10.1097\/MPA.0000000000000186"},{"key":"13","doi-asserted-by":"crossref","unstructured":"13) Ohtsuka T, Mori Y, Ishigami K, et al. Clinical significance of circumportal pancreas, a rare congenital anomaly, in pancreatectomy. Am J Surg 2017; 214: 267\u201372.","DOI":"10.1016\/j.amjsurg.2016.11.018"},{"key":"14","doi-asserted-by":"crossref","unstructured":"14) Yuan H, Wu P, Chen J, et al. Radical antegrade modular pancreatosplenectomy for adenocarcinomaof the body of the pancreas in a patient with portal annular pancreas, aberrant hepatic artery, and absence of the celiac trunk: a case report. Medicine (Baltimore) 2017; 96: e8738.","DOI":"10.1097\/MD.0000000000008738"},{"key":"15","doi-asserted-by":"crossref","unstructured":"15) Kuriyama N, Hatanaka T, Gyoten K, et al. 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