Fig. 4

Process of exploring the potential sources of heterogeneity on DFS. a galbraith plot for DFS. b Forest plot for DFS after Ogawa S et al. (2015) is omitted. c change of heterogeneity before and after Ogawa S et al. (2015) is omitted. Weights are from random-effects analysis. P value for heterogeneity. HR, hazard ratio; DFS, disease-free survival; SE, standard error