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APA Citation
Huijnen, I. P. J., Verbunt, J. A., Wittink, H. M., & Smeets, R. J. E. M. (n.d.). physical performance measurement in chronic low back pain: measuring physical capacity or pain-related behaviour?. European journal of physiotherapy, 15, 103–110. http://access.bl.uk/ark:/81055/vdc_100042618017.0x000010