Jie-hui Tan, Wan-yan Zhou, Lei Zhou, Rong-chang Cao, and Guo-wei Zhang. “Viral Hepatitis B and C Infections Increase the Risks of Intrahepatic and Extrahepatic Cholangiocarcinoma: Evidence from a Systematic Review and Meta-Analysis”. Turkish Journal of Gastroenterology 31, no. 3 (April 20, 2020): 246–256. Accessed July 17, 2025. https://tjg.avesjournals.com/index.php/tjg/article/view/3871.