BibTex format
@article{Cook:2019:10.3310/hta23600,
author = {Cook, JA and Julious, SA and Sones, W and Hampson, LV and Hewitt, C and Berlin, JA and Ashby, D and Emsley, R and Fergusson, DA and Walters, SJ and Wilson, ECF and MacLennan, G and Stallard, N and Rothwell, JC and Bland, M and Brown, L and Ramsay, CR and Cook, A and Armstrong, D and Altman, D and Vale, LD},
doi = {10.3310/hta23600},
journal = {HEALTH TECHNOLOGY ASSESSMENT},
pages = {1--+},
title = {Practical help for specifying the target difference in sample size calculations for RCTs: the DELTA<SUP>2</SUP> five-stage study, including a workshop},
url = {http://dx.doi.org/10.3310/hta23600},
volume = {23},
year = {2019}
}