Clinical efficacy of one-hole split endoscopy vs. unilateral biportal endoscopy for the treatment of single-segment lumbar spinal stenosis: a retrospective study with 2-year follow-up - Qing, Peidong; Guo, Wenlong; Xie, Shiming; Zhao, Shengxin; Cui, Liqiang; Li, Mingfan; Gong, Shuangquan; Hu, Youpeng (Frontiers in Surgery, 2025)