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Phillips, R. Pharmacologic treatment of anal fissure with botoxin, diltiazem, or bethanechol. J Gastrointest Surg 6, 281–283 (2002). https://doi.org/10.1016/S1091-255X(01)00079-8
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DOI: https://doi.org/10.1016/S1091-255X(01)00079-8