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Kaplan-Meier curves by maintenance metronidazole group: (A) fistula-free survival in the primary cohort; (B) fistula-free survival in the subset observed until death; (C) postrecurrence survival in the primary cohort; and (D) postrecurrence survival in the subset observed until death. MM, maintenance metronidazole; NOMM, no maintenance metronidazole.
