What factors explains the number of physical therapy treatment sessions in patients referred with low back pain: a multilevel analysis.

Swinkels, I.C.S., Wimmers, R.H., Groenewegen, P.P., Bosch, W.J.H. van den, Ende, C.H.M. van den. What factors explains the number of physical therapy treatment sessions in patients referred with low back pain: a multilevel analysis. BMC Health Services Research: 2005, 5(74)