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Funnel plot analysis of the included articles’ publication bias about diabetes mellitus and nasopharyngeal carcinoma.
Notes: (A) Funnel plots based on pooled analyses of OR for evaluating the association between diabetes and nasopharyngeal carcinoma risk; (B) funnel plots based on pooled analyses of hazard ratio for evaluating the impact of diabetes on the prognosis of nasopharyngeal carcinoma patients.
Abbreviation: OR, odds ratio.
