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Kaplan-Meier curves for the symptom-fee period in patients undergoing intrasphincteric botulinum toxin injection (Botox) or balloon dilation (BD). A significant difference in the symptom-free period was observed between the Botox and BD groups (13 months [range, 1 to 70] vs. 29 months [range, 6 to 72], respectively; p = 0.036).
