DELTA2 guidance on choosing the target difference and undertaking and reporting the sample size calculation for a randomised controlled trial

Cook, J A, Julious, S A, Sones, W, Hampson, L V, Hewitt, C, Berlin, J A, Ashby, D, Emsley, R, Fergusson, D A, Walters, S J, Wilson, E C F, Maclennan, G, Stallard, N, Rothwell, J C, Bland, M, Brown, L, Ramsay, C R, Cook, A, Armstrong, D, Altman, D & Vale, L D 2018, 'DELTA 2 guidance on choosing the target difference and undertaking and reporting the sample size calculation for a randomised controlled trial', Trials, vol. 19, 606. https://doi.org/10.1186/s13063-018-2884-0