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Bang, Y., Doi, T., Braud, F. D., Piha-Paul, S., Hollebecque, A., Razak, A. A., Lin, C., Ott, P., He, A., Yuan, S., Koshiji, M., Lam, B., & Aggarwal, R. (n.d.). 525 Safety and efficacy of pembrolizumab (MK-3475) in patients (pts) with advanced biliary tract cancer: Interim results of KEYNOTE-028. European journal of cancer, 51, S112–. http://access.bl.uk/ark:/81055/vdc_100030628048.0x00000a