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Bile reflux in columnar-lined Barrett's oesophagus.S Y Iftikhar, J D Hardcastle, S J Ledingham et al.|PubMed|1993Cited by 86
Twenty four hour oesophageal acidity in achalasia before and after pneumatic dilatation.H L Smart, Mark A. Atkinson, P N Foster et al.|Gut|1987Cited by 86