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Methods for specifying the target difference in a randomised controlled trial: the Difference ELicitation in TriAls (DELTA) systematic review.
Hislop J, Adewuyi TE, Vale LD, Harrild K, Fraser C, Gurung T, Altman DG, Briggs AH, Fayers P, Ramsay CR, Norrie JD, Harvey IM, Buckley B, Cook JA; DELTA group. Hislop J, et al. PLoS Med. 2014 May 13;11(5):e1001645. doi: 10.1371/journal.pmed.1001645. eCollection 2014 May. PLoS Med. 2014. PMID: 24824338 Free PMC article. Review.