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McLeod, R.S., Evans, J. Symptomatic care and nitroglycerin in the management of anal fissure. J Gastrointest Surg 6, 278–280 (2002). https://doi.org/10.1016/S1091-255X(01)00078-6
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DOI: https://doi.org/10.1016/S1091-255X(01)00078-6