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Conci, S. et al. (n.d.). What is the most accurate lymph node staging method for perihilar cholangiocarcinoma? Comparison of UICC/AJCC pN stage, number of metastatic lymph nodes, lymph node ratio, and log odds of metastatic lymph nodes. European journal of surgical oncology. 43 (4), pp. 743-750. [Online].