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A review of cluster randomized trials found statistical evidence of selection bias.
J Clin Epidemiol. 2018 Jul;99:106-112. doi: 10.1016/j.jclinepi.2018.03.010. Epub 2018 Mar 26.
J Clin Epidemiol. 2018.
PMID: 29596972
Review.
Baseline testing in cluster randomised controlled trials: should this be done?
Bolzern JE, Mitchell A, Torgerson DJ.
Bolzern JE, et al.
BMC Med Res Methodol. 2019 May 17;19(1):106. doi: 10.1186/s12874-019-0750-8.
BMC Med Res Methodol. 2019.
PMID: 31101078
Free PMC article.
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