van der Roer N, van Tulder MW, Barendse JM, van Mechelen W, Franken WK, Ooms AC, de Vet HC. Cost-effectiveness of an intensive group training protocol compared to physiotherapy guideline care for sub-acute and chronic low back pain: design of a randomised controlled trial with an economic evaluation. [ISRCTN45641649]. BMC Musculoskelet Disord. 2004 Nov 23;5:45.
Power C, Frank J, Hertzman C, Schierhout G, Li L. Predictors of low back pain onset in a prospective British study. American Journal of Public Health, 2001; 91 (10): 1671-1678.
Mannion AF, Helbling D, Pulkovski N et al. Spinal segmental stabilisation exercises for chronic low back pain: programme adherence and its influence on clinical outcome. European Spine Journal. 2009, 18 (12): 1881-1891; DOI 10.1007/s00586-009-1093-7.
van den Heuvel SG, Ariëns GAM, Boshuizen HC, Hoogendoorn WE, Bongers PM. Prognostic factors related to recurrent low-back pain and sickness absence. Scand J Work Environ Health 2004;30(6):459-467.
