Nozawa, Hiroaki, Soichiro Ishihara, Kazushige Kawai, Keisuke Hata, Tomomichi Kiyomatsu, Toshiaki Tanaka, Takeshi Nishikawa, et al. 2017. “A High Preoperative Carbohydrate Antigen 19-9 Level Is a Risk Factor for Recurrence in Stage II Colorectal Cancer”. Acta Oncologica 56 (5):2017-06. https://doi.org/10.1080/0284186X.2016.1257866.