Weinstein SM, Poultsides L, Baaklini LR, Mörwald EE, Cozowicz C, Saleh JN, et al. Postoperative delirium in total knee and hip arthroplasty patients: a study of perioperative modifiable risk factors. Brit J Anaesth 2018;120:999–1008. https://doi.org/10.1016/j.bja.2017.12.046.