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Publication bias examination. (A) Begg’s funnel plots assessing the publication bias for OS (p=0.921); (B) Egger’s test assessing the publication bias for OS (p=0.581); (C) Begg’s funnel plots assessing the publication bias for DFS (p=0.452); and (D) Egger’s test assessing the publication bias for DFS (p=0. 0.826).
