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Letter
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  1. 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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Knight M, Nelson-Piercy C, Kurinczuk JJ, et al
Authors' response

Publication history

  • First published October 11, 2010.
Online issue publication 
December 10, 2010

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