Fig. 2From: Circulating vitamin D level before initiating chemotherapy impacts on the time-to-outcome in metastatic colorectal cancer patients: systematic review and meta-analysisFunnel plots displaying the chosen studies for overall survival (OS) (A) and progression-free survival (PFS) (B). The x-axis represents the estimated outcome (HR: Hazard Ratio), while the y-axis typically indicates the standard error. No noticeable asymmetry is observed in the funnel plot, suggesting the absence of publication bias or small-study effects in this specific analysisBack to article page