John D Norrie

Use of methods for specifying the target difference in randomised controlled trial sample size calculations: Two surveys of trialists’ practice

Andrew H Briggs, Craig R Ramsay, Jonathan A Cook, 2014, Clinical trials.

Specifying the target difference in the primary outcome for a randomised controlled trial: guidance for researchers

Douglas G Altman, Andrew H Briggs, Craig R Ramsay, 2015, Trials.