British Journal of Anaesthesia, 2017; 119(2): 281–3, DOI 10.1093/bja/aex082

Reference 9 was incorrectly cited in the above paper. The correct reference is: Lee A, Mu JL, Joynt GM, Chiu CH, Lai VKW, Gin T, Underwood MJ. Risk prediction models for delirium in the intensive care unit after cardiac surgery: a systematic review and independent external validation. Br J Anaesth. 2017 Mar 1;118(3):391–399. doi: 10.1093/bja/aew476.

This has now been corrected online.