, H. K. (2019) “The expression of matrix metalloproteinases in intrahepatic cholangiocarcinoma, hilar (Klatskin tumor), middle and distal extrahepatic cholangiocarcinoma, gallbladder cancer, and ampullary carcinoma: Role of matrix metalloproteinases in tumor progression”, Turkish Journal of Gastroenterology 1, 20(1), pp. 15–18. doi: .