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Multivariable Cox shared-frailty model demonstrating the effect of travel distance for treatment and other covariates on survival among 118,000 patients treated for head and neck squamous cell carcinoma. Estimated adjusted hazard ratios are shown as black circles; the 95% confidence intervals are represented by horizontal lines. AJCC indicates American Joint Committee on Cancer; LCL, lower confidence limit; UCL, upper confidence limit.
