- Correspondence to Dr Maria Hughes, UKCRC Centre of Excellence for Public Health Research Northern Ireland, School of Medicine, Dentistry and Biomedical Sciences, Institute of Clinical Sciences B, Queens University Belfast, Grosvenor Road, Belfast BT126BJ, UK;
- Received April 1, 2014
- Revised June 2, 2014
- Accepted June 3, 2014
- First published July 30, 2014.
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