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Wilson, Julie S and Fitzsimons, Donna and Bradbury, Ian and Elborn, J Stuart (2008) Does additional support by nurses enhance the effect of a brief smoking cessation intervention in people with moderate to severe chronic obstructive pulmonary disease? A randomised controlled trial. International Journal of Nursing Studies, 45, (4), pp. 508-517. https://doi.org/10.1016/j.ijnurstu.2006.10.001.