Biportal Endoscopic Decompression of Exiting and Traversing Nerve Roots Througha Single Interlaminar Window Using a Contralateral Approach: Technical Feasibilitiesand Morphometric Changes of the Lumbar Canal and Foramen -World Neurosurg. (2018) 117:153-161. Contralateral Interlaminar Keyhole Percutaneous Endoscopic Lumbar Surgery in Patients with Unilateral Radiculopathy - World Neurosurg. (2017) 101:33-41. 척추 내시경 시술 및 수술 3000례 달성 척추관절 비수술 치료 10000례 달성