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Brit Med J. 1961 Feb; 1 (5224): 463-9.","DOI":"10.1136\/bmj.1.5224.463"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5. Marks CG, Ritchie JK, Lockhart-Mummery HE. Anal fistula in Crohn's disease. Br J Surg. 1981 Aug; 68 (8): 525-7.","DOI":"10.1002\/bjs.1800680802"},{"key":"6","doi-asserted-by":"crossref","unstructured":"6. Shukla HS, Gupta SC, Singh G, et al. Tubercular fistula in ano. Br J Surg. 1988 Jan; 75: 38-9.","DOI":"10.1002\/bjs.1800750114"},{"key":"7","doi-asserted-by":"crossref","unstructured":"7. Culp CE. Chronic hidradenitis of the anal canal: a surgical skin disease. Dis Colon Rectum. 1983 Oct; 26 (10): 669-76.","DOI":"10.1007\/BF02553341"},{"key":"8","doi-asserted-by":"crossref","unstructured":"8. Zanotti C, Martinez-Puente C, Pascual I, et al. An assessment of the incidence of fistula-in-ano in four countries of the European Union. Int J Colorectal Dis. 2007 Dec; 22 (12):1459-62.","DOI":"10.1007\/s00384-007-0334-7"},{"key":"9","unstructured":"9. Sainio P. 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Garcia-Aguilar J, Belmonte C, Wong WD, et al. Anal fistula surgery. Factors associated with recurrence and incontinence. Dis Colon Rectum. 1996 Jul; 39 (7): 723-9.","DOI":"10.1007\/BF02054434"},{"key":"23","doi-asserted-by":"crossref","unstructured":"23. Takano M, Fujiyoshi T, Takagi T. Anterior anal fistulas in women. Nihon Daicho Komonbyo Gakkai Zasshi. 1990; 43: 165-71.","DOI":"10.3862\/jcoloproctology.43.165"},{"key":"24","doi-asserted-by":"crossref","unstructured":"24. Ommer A, Herold A, Berg E, et al. German S3 guideline: anal abscess. Int J Colorectal Dis. 2012 Jun; 27 (6): 831-7.","DOI":"10.1007\/s00384-012-1430-x"},{"key":"25","doi-asserted-by":"crossref","unstructured":"25. Takano M, Fujiyoshi T. Comparison of preoperative digital rectal examination and anal ultrasound in anal fistula diagnoses. Nihon Daicho Komonbyo Gakkai Zasshi. 1992; 45: 1033-8.","DOI":"10.3862\/jcoloproctology.45.7_1033"},{"key":"26","doi-asserted-by":"crossref","unstructured":"26. Matsushima M. 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