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Aim The present study aims to evaluate and compare the efficacy of two nitrate gels, containing isosorbide-5-mononitrate (ISMN) or glyceryl trinitrate (GTN), in the therapy of chronic anal fissure. Materials and methods The patients were randomly assigned to three groups: 0.1% ISMN gel (21 patients), 0.1% GTN gel (21 patients) and a placebo group (ten patients). The ethic committee of our hospital...