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APA Citation
Gear, M. W., Dent, N. A., Colin-Jones, D. G., Lennard-Jones, J. H., & Colley, J. R. (1990). future needs for ERCP: incidence of conditions leading to bile duct obstruction and requirements for diagnostic and therapeutic biliary procedures.. Gut, 31(10), 1150–1155. http://access.bl.uk/ark:/81055/vdc_100135160040.0x000046