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. 2019 Jul 5;11(3):228–234. doi: 10.1136/flgastro-2019-101227

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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Per patient faecal calprotectin concentrations during active and treated/inactive collagenous colitis. Dashed line indicates the UK National Health Service (NHS) recommended cut-off for referral to colonoscopy,⁴⁸ which is based on National Institute for Health and Care Excellence (NICE) guidelines for inflammatory bowel diseases (adapted from Wildt et al [50]).