RT Journal Article SR Electronic T1 Performing baseline testing in cluster randomised controlled trials JF BMJ Evidence-Based Medicine JO BMJ EBM FD BMJ Publishing Group Ltd SP bmjebm-2019-111283 DO 10.1136/bmjebm-2019-111283 A1 Ushma Galal A1 Thomas R Fanshawe YR 2019 UL http://ebm.bmj.com/content/early/2019/12/02/bmjebm-2019-111283.abstract AB