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Cook, J. A. et al. (2015) Specifying the target difference in the primary outcome for a randomised controlled trial: guidance for researchers. Trials, 16(1), 12. (doi: 10.1186/s13063-014-0526-8) (PMID:25928502) (PMCID:PMC4302137)
Cook, J. A., Hislop, J. M., Altman, D. G., Briggs, A. H. , Fayers, P. M., Norrie, J. D., Ramsay, C. R., Harvey, I. M. and Vale, L. D. (2014) Use of methods for specifying the target difference in randomised controlled trial sample size calculations: Two surveys of trialists' practice. Clinical Trials, 11(3), pp. 300-308. (doi: 10.1177/1740774514521907) (PMID:24603006)
Hislop, J. et al. (2014) Methods for specifying the target difference in a randomised controlled trial: the Difference ELicitation in TriAls (DELTA) Systematic Review. PLoS Medicine, 11(5), e1001645. (doi: 10.1371/journal.pmed.1001645)