- Correspondence to Dr Sohinee Bhattacharya, Epidemiology Group, Dugald Baird Centre for Research on Women's Health, Aberdeen Maternity Hospital, University of Aberdeen AB25 2ZL, UK;
- Received August 7, 2014
- Revised October 14, 2015
- Accepted October 22, 2015
- First published December 7, 2015.
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