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APA Citation
Bull, C., Yates, R., Sarkar, D., Deanfield, J., & de Leval, M. (2000). scientific, ethical, and logistical considerations in introducing a new operation: a retrospective cohort study from paediatric cardiac surgery. BMJ, 320(7243), 1168–1173. http://access.bl.uk/ark:/81055/vdc_100142181247.0x000022