@article{article, title  = {{DELTA² guidance on choosing the target difference and undertaking and reporting the sample size calculation for a randomised controlled trial}},

 publisher = {{BMJ Publishing Group}},

 url = {{https://eprints.whiterose.ac.uk/id/eprint/139500 https://doi.org/10.1136/bmj.k3750 }},

 year = {{2018}},

 month = {{11}},

 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 et al}},

 doi = {{10.1136/bmj.k3750}},

 journal = {{BMJ}},

 note = {{Accessed on 2025/10/31}}}