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Choosing the target difference and undertaking and reportin..:

Sones, William ; Julious, Steven A ; Rothwell, Joanne C...
Sones , W , Julious , S A , Rothwell , J C , Ramsay , C R , Hampson , L V , Emsley , R , Walters , S J , Hewitt , C , Bland , M , Fergusson , D A , Berlin , J A , Altman , D , Vale , L D & Cook , J A 2018 , ' Choosing the target difference and undertaking and reporting the sample size calculation for a randomised controlled trial - the development of the DELTA guidance ' , Trials , vol. 19 , no. 1 , pp. 542 . https://doi.org/10.1186/s13063-018-2887-x.  , 2018