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  1. Dr M 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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Citation

Knight M, Nelson-Piercy C, Kurinczuk JJ, et al
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Publication history

  • First published February 11, 2009.
Online issue publication 
April 18, 2016

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