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APA Citation
Van der Hulst, H., Dekker, J., Bastiaannet, E., van der Bol, J., van den Bos, F., Hamaker, M., Schiphorst, A., Sonneveld, D., Schuijtemaker, J., de Jong, R., Portielje, J., & Souwer, E. (n.d.). validation of the ACS NSQIP Surgical Risk Calculator in older patients with colorectal cancer undergoing elective surgery. Journal of geriatric oncology, 12, S67–. http://access.bl.uk/ark:/81055/vdc_100148051982.0x00001c