Vaishnav, M., Garg, S., & Popat, V. (2017). Role of ca 19-9 as a tumor marker in diagnosis and prognosis of pancreatic carcinoma and cholangiocarcinoma (A study of 46 cases). International Journal of Medical Research and Review, 5(5), 505-514. https://doi.org/10.17511/ijmrr.2017.i05.12