A nomogram for predicting cancer-specific survival in different age groups for operable gastric cancer: a population-based study - Guo, Shuai; Shang, Mu-Yan; Dong, Zhe; Zhang, Jun; Wang, Yue; Zheng, Zhi-Chao; Zhao, Yan (Translational Cancer Research; Vol 9, No 4 (April 30, 2020): Translational Cancer Research, 2020)