Impact of Concomitant Grade I Degenerative Spondylolisthesis on Clinical and Radiographic Outcomes Following Biportal Endoscopic versus Microscopic Laminectomy for Lumbar Spinal Stenosis: A Post Hoc Analysis of a Multicenter Randomized Clinical Trial - Hyun-Jin Park; Min-Seok Kang; Kwang-Sup Song; Dae-Woong Ham; Ho-Joong Kim; Ki-Han You; Seung-Yeon Jeong; Jin-Sung Kim; Sang-Min Park (Global Spine Journal, 2026)