TY - JOUR AU - Helmhout P. AU - Staal J. AU - Petersen T. AU - Rainville J. AU - Shaw W. AU - Maher C. BT - Spine CN - Y LA - eng LB - MSjournal M1 - 16 PY - 2008 SP - 1782 EP - 8. T2 - Spine TI - Exercise therapy and low back pain: insights and proposals to improve the design, conduct, and reporting of clinical trials on the effects of therapeutic exercise in low back pain VL - 33 ER -