Article info
Correspondence
External validity is also an ethical consideration in cluster-randomised trials of policy changes: the author’s reply
- Correspondence to Dr Karla Hemming, School of Health and Population Sciences, University of Birmingham, Birmingham B15 2TT, UK; k.hemming{at}bham.ac.uk
Citation
External validity is also an ethical consideration in cluster-randomised trials of policy changes: the author’s reply
Publication history
- Received September 7, 2018
- Accepted September 7, 2018
- First published October 12, 2018.
Online issue publication
January 18, 2019
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- Previous version (12 October 2018).
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© Author(s) (or their employer(s)) 2019. No commercial re-use. See rights and permissions. Published by BMJ.