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

Authors

  1. Correspondence to Dr Karla Hemming, School of Health and Population Sciences, University of Birmingham, Birmingham B15 2TT, UK; k.hemming{at}bham.ac.uk
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Citation

Hemming K On behalf of all authors
External validity is also an ethical consideration in cluster-randomised trials of policy changes: the author’s reply
BMJ Quality & Safety 2019;28:168.

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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© Author(s) (or their employer(s)) 2019. No commercial re-use. See rights and permissions. Published by BMJ.