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Table 1 Numbers and reasons for the excluded articles after full-text review

From: Prognostic value of cervical nodal necrosis on staging imaging of nasopharyngeal carcinoma in era of intensity-modulated radiotherapy: a systematic review and meta-analysis

Reasons to exclude the articles after the full-text review Numbers of studies Numbers in the references list
Patients treated with other than IMRT 3 [9,10,11]
HRs of CNN for DMFS was not performed or unable to calculate 7 [12,13,14,15,16,17,18]
Survival analysis was not performed for CNN 2 [32, 33]
CNN + necrotic primary tumour as one variable was assessed 1 [34]
Studies conducted by the same institution with overlapping patient recruitment periods and analysis performed for the same CNN pattern 5 [35,36,37,38,39]
  1. IMRT Intensity-modulated radiotherapy, DMFS Distant metastases free survival, HR Hazard ratio, CNN Cervical nodal necrosis