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Enrolment and allocation of patients and healthy controls in the two study cohorts reported. Note: some patients with Rome III-positive IBS-D participated in both ‘transit’ and ‘colonoscopy’ aims. The numbers of participants with BAD or IBS-D without ABAM are indicated in the two aims of the study. ABAM, abnormal bile acid metabolism; BAD, bile acid diarrhoea; IBS-D, irritable bowel syndrome with diarrhoea; NHV, normal healthy volunteers.
