Preoperative predictors for postoperative clinical outcome in lumbar spinal stenosis: systematic review.
Aalto, TJ; Malmivaara, Antti; Kovacs, F; Herno, A; Alen, M; Salmi, L; Kroger, H; Andrade, J; Jimenez, R; Tapaninaho, A; Turunen, V; Savolainen, S; Airaksinen, O. (2006)