Opioid-free anesthesia with quadratus lumborum block and Esketamine enhances postoperative recovery in laparoscopic colon cancer surgery: A randomized controlled trial. - Cheng, Chuan-xi; Wang, Kai; Jiang, Yu-xia; Yi, Xue; Zhou, Wei; Yang, Shao-jie; Zhou, Mi; Shu, Ai-hua; Chen, Xiao-bo (Scientific Reports, 2025)