Validation of the ACS NSQIP Surgical Risk Calculator in older patients with colorectal cancer undergoing elective surgery. (December 2021) - Van der Hulst, H.; Dekker, J.W.T.; Bastiaannet, E.; van der Bol, J.; van den Bos, F.; Hamaker, M.E.; Schiphorst, A.; Sonneveld, D.J.A.; Schuijtemaker, J.S.; de Jong, R.J.; Portielje, J.E.A.; Souwer, E.T.D.