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Publication bias assessment using funnel plot. A. Funnel plot of recurrence rate; B. Funnel plot of mortality; C. Funnel plot of RFS; D. Funnel plot of 5-year OS; E. Funnel plot of 1-year OS rate; F. Funnel plot of 3-year OS rate; G. Funnel plot of 5-year OS rate; H. Funnel plot of incidence of adverse reactions. SE: standard error; RR: relative risk; RFS: recurrence free survival; OS: overall survival.
