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. 2011 Nov 14;1(2):e000206. doi: 10.1136/bmjopen-2011-000206

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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.

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Flow diagram of participants in the study. AMND, Aberdeen Maternity and Neonatal Database; ISD, Information and Services Division NHS Scotland.