- Correspondence to Stephen J McCall, Department of Obstetrics and Gynaecology, Dugald Baird Centre, Aberdeen Maternity Hospital, University of Aberdeen, Cornhill Road, Aberdeen AB25 2ZL, UK;
- Received March 28, 2014
- Revised July 21, 2014
- Accepted August 29, 2014
- First published September 16, 2014.
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