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APA Citation
Hirst, C., Ingram, G., Swingler, R., Compston, D. A. S., Pickersgill, T., & Robertson, N. P. (2008). change in disability in patients with multiple sclerosis: a 20-year prospective population-based analysis. Journal of neurology, neurosurgery and psychiatry, 79(10), 1137–1143. http://access.bl.uk/ark:/81055/vdc_100135163486.0x00002e