Fig. 3

Process of exploring the potential sources of heterogeneity on OS. a galbraith plot for OS. b Forest plot for OS after Jian-Hui C et al. (2016) is omitted. c change of heterogeneity before and after Ogawa S et al. (2016) is omitted. Weights are from random-effects analysis. P value for heterogeneity. Abbreviations: HR, hazard ratio; OS, disease-free survival; SE, standard error