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External validity is also an ethical consideration in cluster-randomised trials of policy changes: the author's reply

Karla Hemming1,

  • 1School of Health and Population Sciences, University of Birmingham, Birmingham B15 2TT, UK k.hemming@bham.ac.uk.

BMJ Quality & Safety
|October 14, 2018
PubMed
Abstract

No abstract available in PubMed .

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