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Murtagh, M J., R G. Thomson, C R. May, T. Rapley, B R. Heaven, R H. Graham, E F. Kaner, L. Stobbart, and M P. Eccles. Qualitative Methods in a Randomised Controlled Trial: The Role of an Integrated Qualitative Process Evaluation in Providing Evidence to Discontinue the Intervention in One Arm of a Trial of a Decision Support Tool. BMJ Group, 2007.

Murtagh, M J., et al. Qualitative Methods in a Randomised Controlled Trial: The Role of an Integrated Qualitative Process Evaluation in Providing Evidence to Discontinue the Intervention in One Arm of a Trial of a Decision Support Tool. BMJ Group, 2007.