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Letter
Authors' response
- Correspondence to Marian Knight, National Perinatal Epidemiology Unit, University of Oxford, Old Road Campus, Oxford OX3 7LF, UK; marian.knight{at}npeu.ox.ac.uk
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Publication history
- First published October 11, 2010.
Online issue publication
April 18, 2016
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© 2011, Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.