Effectiveness of behavioral graded activity after first-time lumbar disc surgery: short term results of a randomized controlled trial

le Ostelo, R. W. J. G., de Vet, H. C. W., Berfelo, M. W., Kerckhoffs, M. R., Vlaeyen, J. W. S., Wolters, P. M. J. C., van den Brandt, P. A.
Foilsithe 2003