![Prognostic factors for perceived recovery or functional improvement in non-specific low back pain: secondary analyses of three randomized clinical trials]()
Prognostic factors for perceived recovery or functional improvement in non-specific low back pain: secondary analyses of three randomized clinical trialsPieter H. Helmhout; J. Bart Staal; Martijn W. Heymans; Chris C. Harts; Erik J. M. Hendriks; Rob A. de Bie · 2010