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Kaplan–Meier estimate for central compartment recurrence-free survival stratifying by sonographic status of the central compartments and prophylactic neck dissection. Solid black line: abnormal CCUS (p=0.0106 vs. negative CCUS); gray line: negative CCUS, no prophylactic neck dissection; dotted black line: negative CCUS, prophylactic neck dissection. CCUS, central compartment ultrasound.
