Correction to: Choosing the target difference and undertaking and reporting the sample size calculation for a randomised controlled trial - the development of the DELTA2 guidance.
Sones W., Julious SA., Rothwell JC., Ramsay CR., Hampson LV., Emsley R., Walters SJ., Hewitt C., Bland M., Fergusson DA., Berlin JA., Altman D., Vale LD., Cook JA.
Following publication of the original article [1], we have been notified of a few mistakes.