The Ottawa Statement on the Ethical Design and Conduct of Cluster Randomized Trials.

PLoS Med · 2012 · PMC3502500 · PMID 23185138

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may be significantno p-value reported

Sixth, whereas risks to individuals may be minor, the risks to the cluster as a whole or to subgroups may be significant, because risks to the group may be underestimated, and vulnerable subgroups within clusters may be difficult to identify.

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