Risk factors for postoperative delirium in ICU patients with severe illness based on systematic review and meta-analysis - Peng, Chen; Wang, Miaoshu; Geng, Yanqing; Ke, Junzhong; Dong, Ping; Qin, Jie; Zhong, Danfeng (Annals of Palliative Medicine; Vol 11, No 1 (January 27, 2022): Annals of Palliative Medicine, 2022)