2[2]Sail JA. Nonoperative treatment of herniated lumbar intervertebral disc with radiculopathy. An outcome study. Spine, 1989, 14:431~437
3[3]Thelander U, Fagerlund M, Friberg S, et al. Straight leg raising test vs, radiologic size, shape, and position of lumber disc herniations. Spine, 1992, 17:395~399