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APA Citation
Tella, S. H., Kommalapati, A., Yadav, S., Bergquist, J. R., Goyal, G., Durgin, L., Borad, M., Cleary, S. P., Truty, M. J., & Mahipal, A. (2020). novel staging system using carbohydrate antigen (CA) 19-9 in extra-hepatic cholangiocarcinoma and its implications on overall survival. European journal of surgical oncology, 46(5), 789–795. http://access.bl.uk/ark:/81055/vdc_100104119423.0x00002f