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APA Citation
Wang, M., Doll, C., Ghosh, S., Fairchild, A., Usmani, N., Tankel, K., Nijjar, T., Severin, D., Mulder, K., Urgoiti, G. R., Mathen, P., & Joseph, K. (n.d.). 139 External Validation of 7th and 8th Editions of the AJCC TNM Staging Classification System for Anal Canal Cancer: A Multi-Institutional Quality Assurance Study. Radiotherapy and oncology, 139, S60–. http://access.bl.uk/ark:/81055/vdc_100094430122.0x00003d