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    Pritchard, C., Smith, J. E., Creanor, S., Squire, R., Barton, A., Benger, J., Cocking, L., Ewings, P., Rockett, M., & ,  (n.d.). the cost‐effectiveness of patient‐controlled analgesia vs. standard care in patients presenting to the Emergency Department in pain, who are subsequently admitted to hospital. Anaesthesia, 72, 953–960. http://access.bl.uk/ark:/81055/vdc_100047807005.0x000063