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APA Citation
Walker, W. C., Marwitz, J. H., Wilk, A. R., Ketchum, J. M., Hoffman, J. M., Brown, A. W., & Lucas, S. (2013). prediction of headache severity (density and functional impact) after traumatic brain injury: A longitudinal multicenter study. Cephalalgia, 33, 998–1008. http://access.bl.uk/ark:/81055/vdc_100170571749.0x00000c