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Evans, B.A, Bedson, E, Bell, P, Hutchings, H, Lowes, L, Rea, D, Seagrove, A, Siebert, S, Smith, G, Snooks, H, Thomas, M, Thorne, K and Russell, I (2013) 'Involving service users in trials: developing a standard operating procedure.' Trials, 14 (219).