Development and validation of a nomogram to predict postoperative delirium in older patients after major abdominal surgery: a retrospective case-control study. - Luo YG; Wu XD; Song YX; Wang XL; Liu K; Shi CT; Wang ZL; Ma YL; Li H; Liu YH; Mi WD; Lou JS; et al. (Perioperative medicine (London, England), 2024)