- Correspondence to Dr Joanne K Ritchie, Department of Obstetrics and Gynaecology, Shrewsbury and Telford NHS Trust, Princess Royal Hospital, Telford TF1 6TF, UK;
- Received October 26, 2017
- Revised February 12, 2018
- Accepted February 14, 2018
- First published March 15, 2018.
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