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Overall survival A. laryngectomy (p=0.000, log-rank test) B. Tumor differentiation (p=0.008, log-rank test) C. T-stage (p=0.000, log-rank test) D. N-stage (p=0.000, log-rank test) E. TNM stage (p=0.000, log-rank test) F. Curves represent 10 years of follow-up.
