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APA Citation
Naji, S. A., Brunt, P. W., Hagen, S., Mowat, N. A., Russell, I. T., Sinclair, T. S., & Tang, T. M. (1993). improving the selection of patients for upper gastrointestinal endoscopy.. Gut, 34(2), 187–191. http://access.bl.uk/ark:/81055/vdc_100137791646.0x000043