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    N. Sengupta et al.. “The clinical predictors of aetiology and complications among 173 patients presenting to the Emergency Department with oesophageal food bolus impaction from 2004–2014.” Alimentary pharmacology & therapeutics, vol. 42, no. 1, 2015, pp. 91–98. http://access.bl.uk/ark:/81055/vdc_100025911131.0x000043