Fig. 2From: Prognostic value of cervical nodal necrosis on staging imaging of nasopharyngeal carcinoma in era of intensity-modulated radiotherapy: a systematic review and meta-analysisForest plots of the meta-analysis showing the pooled hazard ratios (HRs) of CNN presence in any nodal group for distant metastases free survival (DMFS). Meta-analysis was performed for the unadjusted HRs (a) and adjusted HRs (b), respectivelyBack to article page