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Algorithm reproduced from ‘Management of Perianal Crohn’s Disease in the Biologic Era’, Coloproctology – A Practical Guide (Eds. Beynon, Harris, Davies, Evans) 2017 Chapter 1 (pgs 1-27), Adegbola SO, et al; Copyright Information – Springer International Publishing AG 2017, reproduced with permission of Springer EUA, examination under anesthesia
