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Review
. 2001 Feb 10;322(7282):355-7.
doi: 10.1136/bmj.322.7282.355.

Contamination in trials: is cluster randomisation the answer?

Affiliations
Review

Contamination in trials: is cluster randomisation the answer?

D J Torgerson. BMJ. .
No abstract available

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References

    1. Campbell MK, Grimshaw JM. Cluster randomised trials: time for improvement. BMJ. 1998;317:1171–1172. - PMC - PubMed
    1. Kerry SM, Bland M. The intracluster correlation coefficient in cluster randomisation. BMJ. 1998;316:1455–1460. - PMC - PubMed
    1. Ukoumunne OC, Gulliford MC, Chinn S, Sterne J, Burney P, Donner A. Evaluations of health care interventions at area and organisation level. In: Black N, Brazier J, Fitzpatrick R, Reeve B, editors. Health services research methods: a guide to best practice. London: BMJ Publishing; 1998. - PMC - PubMed
    1. Campbell MK, Grimshaw J, Steen N. Sample size calculations for cluster randomised trials. J Health Services Res Policy. 2000;5:12–16. - PubMed
    1. Alexander FE, Anderson TJ, Brown HK, Forrest APM, Hepburn W, Kirkpatrick AE, et al. 14 years of follow-up from the Edinburgh randomised trial of breast-cancer screening. Lancet. 1999;353:1903–1908. - PubMed