Funnel plot and sensitivity analysis for prognosis of patients with OSCC (A: Funnel plot; B: sensitivity analysis).

<p>Funnel plot and sensitivity analysis for prognosis of patients with OSCC (A: Funnel plot; B: sensitivity analysis).</p

The information size to demonstrate the relevance of survivin protein expression with lymph node metastasis.

<p>The dashed curve represents the cumulative Z-curve. The solid line represents the trial sequential monitoring boundary.</p

Clinicopathological and methodological features of eligible studies.

<p>Clinicopathological and methodological features of eligible studies.</p

Flow diagram of the literature search process.

<p>Flow diagram of the literature search process.</p

Sensitivity analysis for clinicopathological features (A: lymph node involvement; B: clinical stage; C: cell differentiation; D: depth of invasion; E: gender; F: age).

<p>Sensitivity analysis for clinicopathological features (A: lymph node involvement; B: clinical stage; C: cell differentiation; D: depth of invasion; E: gender; F: age).</p