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Croft, A., Walsh, A., Doecke, J., Cooley, R., Howlett, M., & Radford‐Smith, G. (2013). outcomes of salvage therapy for steroid‐refractory acute severe ulcerative colitis: ciclosporin vs. infliximab. Alimentary pharmacology & therapeutics, 38(3), 294–302. http://access.bl.uk/ark:/81055/vdc_100024478765.0x00000a