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Guthrie, E., Creed, F., Fernandes, L., Ratcliffe, J., Van der Jagt, J., Martin, J., Howlett, S., Read, N., Barlow, J., Thompson, D., & Tomenson, B. (2003). cluster analysis of symptoms and health seeking behaviour differentiates subgroups of patients with severe irritable bowel syndrome. Gut, 52(11), 1616–1622. http://access.bl.uk/ark:/81055/vdc_100137792144.0x00004e