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APA Citation
Harkness, E. F., Nahit, E. S., Macfarlane, G. J., Silman, A. J., McBeth, J., & Dunn, G. (2003). generalised estimating equations and low back pain. Occupational and environmental medicine, 60(5), 378–381. http://access.bl.uk/ark:/81055/vdc_100135144628.0x000012