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Webster, F., Weijer, C., Todd, L., Grimshaw, J. M., Marshall, A. P., Cook, D., MacLennan, G., Cuthbertson, B. H. and Francis, J. (2016). The ethics of future trials: qualitative analysis of physicians' decision making. Trials, 17(12), doi: 10.1186/s13063-015-1137-8