- Correspondence to Dr J M Hawdon, Women's and Children's Health, Barts Health NHS Trust, Executive Offices, Newham University Hospital, Glen Road, London E13 8SL, UK;
- Received 24 March 2016
- Revised 21 July 2016
- Accepted 25 July 2016
- Published in print 1 March 2017.
- Published online 16 February 2017.
- Published first 23 August 2016.
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