Supplementary Appendix 1. Search Strategy. MEDLINE (Ovid, 1946)

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MEDLINE (Ovid, 1946) 1. ulcerative colitis. mp. or exp Colitis, Ulcerative/2. histol*. mp. or
exp Pathology, Clinical/3. exp Immunohistochemistry/or immunohisto*. mp. 4. exp …