Retrospective Cohort Study
Copyright ©The Author(s) 2020.
World J Gastrointest Oncol. Oct 15, 2020; 12(10): 1119-1132
Published online Oct 15, 2020. doi: 10.4251/wjgo.v12.i10.1119
Figure 2
Figure 2 Overall survival curves for the three periods calculated by the Kaplan-Meier method (P = 0. 000).