AUTHOR=Zhao Yajuan , Zang Chuanbo , Ren Shengjie , Fu Jianbin , Liu Ning , Zhou Ziyu , Lang Bao TITLE=Effects of different levels of controlled hypotension on regional cerebral oxygen saturation and postoperative cognitive function in patients undergoing total knee arthroplasty JOURNAL=Frontiers in Medicine VOLUME=9 YEAR=2022 URL=https://www.frontiersin.org/journals/medicine/articles/10.3389/fmed.2022.989341 DOI=10.3389/fmed.2022.989341 ISSN=2296-858X