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APA Citation
Berrill, J. W., Turner, J. K., Hurley, J. J., Swift, G., Dolwani, S., & Green, J. T. (2012). upper gastrointestinal cancer in its early stages is predominantly asymptomatic. Frontline gastroenterology, 3(1), 47–51. http://access.bl.uk/ark:/81055/vdc_100134878591.0x00000b