Fig. 1From: Acute toxicity in comprehensive head and neck radiation for nasopharynx and paranasal sinus cancers: cohort comparison of 3D conformal proton therapy and intensity modulated radiation therapyMean dose volume histograms (DVHs) to organs at risk by radiation treatment modality, separated by node negative and node positive patients. The mean DVH is presented with 95Â % confidence intervalsBack to article page