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Funnel plots of publication bias; (a): overall survival in all RCTs, (b): OS in NSCLC RCTs, (c): overall survival (OS) in head and neck squamous cell carcinoma (HNSCC) RCTs, (d): progression-free survival (PFS) in all RCTs, (e): PFS in non-small cell lung cancer (NSCLC) RCTs, (f): PFS in HNSCC RCTs.
