Percutaneous Endoscopic Lumbar Herniectomy for High-Grade Down-Migrated L4–L5 Disc through an L5-S1 Interlaminar Approach: A Technical Note - Choi, G.; Prada, N.; Modi, H. N.; Vasavada, N. B.; Kim, J.-S.; Lee, S.-H. (min - Minimally Invasive Neurosurgery, 2010)