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Perez-Legaz, J., Arroyo, A., Ruiz-Tovar, J. et al. Treatment of chronic anal fissure with topical nitroglycerin ointment 0.4%: a prospective clinical study. Tech Coloproctol 15, 475–476 (2011). https://doi.org/10.1007/s10151-011-0725-1
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DOI: https://doi.org/10.1007/s10151-011-0725-1