Development of a nomogram to predict overall survival among non-metastatic breast cancer patients in China: a retrospective multicenter study oleh Zi-Hao Pan, MD, Kai Chen, MD, Pei-Xian Chen, MD, Li-Ling Zhu, MD, Shun-Rong Li, MD, Qian Li, MD, Feng-Tao Liu, MD, Min Peng, MD, Feng-Xi Su, MD, Qiang Liu, MD, PhD, Guo-Lin Ye, MD, Mu-Sheng Zeng, MD, Er-Wei Song, MD, PhD