A 29-year-old patient presents with an anovaginal fistula following a vaginal delivery 2 years ago and which was complicated by a fourth-degree perineal laceration. She reports incontinence to gas and liquid stool. Digital rectal examination demonstrates diminished sphincter tone, and anoscopy reveals a 1-cm internal fistula opening in the anterior midline at the dentate line. The most next appropriate step is
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