The prognostic value of a geriatric risk score for older patients with colorectal cancer. Issue 2 (February 2019) - Souwer, E.; Hultink, D.; Bastiaannet, E.; Hamaker, M.; Schiphorst, A.; Pronk, A.; van der Bol, J.; Steup, W.; Dekker, J.W.; Portielje, J.; van der Bos, F.