“Isolated Extrahepatic Intraductal Papillary Neoplasm of the Bile Duct: A Rare Type of Bile Duct Tumour”, GJMR, vol. 18, no. F5, pp. 7–9, Nov. 2018, Accessed: Aug. 13, 2026. [Online]. Available: https://medicalresearchjournal.org/index.php/GJMR/article/view/1598