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Associations of the hazard ratio for overall survival and number of examined lymph nodes. Locally Weighted Scatterplot Smoothing (LOWESS) smoothing fitting curves with a fitting bandwidth of 2/3 are shown in yellow and the structural breakpoint was determined with use of the Chow test in the Surveillance, Epidemiology, and End Results (SEER) database (A and B) and the China registry (C and D). ELN, examined lymph node.
