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Zbar, A.P., Shenoy, R.K. Synchronous carcinoma of the sigmoid colon and a perianal fistula. Dis Colon Rectum 47, 544–545 (2004). https://doi.org/10.1007/s10350-003-0069-7
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DOI: https://doi.org/10.1007/s10350-003-0069-7