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Differential recruitment in a cluster randomized trial in primary care : the experience of the UK Back pain, Exercise, Active management and Manipulation (UK BEAM) feasibility study
Farrin, Amanda.  Clinical Trials: Journal of the Society for Clinical Trials.  v. 2. no. 2.   2005-04-01. p. 119 - 124... issn: 1740-7745 .   

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