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APA Citation
Smart, H. L., Foster, P. N., Evans, D. F., Slevin, B., & Atkinson, M. (1987). twenty four hour oesophageal acidity in achalasia before and after pneumatic dilatation.. Gut, 28(7), 883–887. http://access.bl.uk/ark:/81055/vdc_100135573161.0x00004c