RT Journal Article SR Electronic T1 Assessing risk factors for delirium after lower extremity joint arthroplasty JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 93 OP 94 DO 10.1136/rapm-2020-101481 VO 46 IS 1 A1 Yi Cheng A1 Fu-Shan Xue A1 Shao-Hua Liu YR 2021 UL http://rapm.bmj.com/content/46/1/93.abstract AB