- Correspondence to Dr Ruth E Hogg, Center for Public Health, Queen’s University Belfast, Institute of Clinical Sciences, 1 Block A, Royal Hospital, Grosvenor Road, Belfast BT12 6BA, Northern Ireland;
- Received March 29, 2017
- Revised June 9, 2017
- Accepted July 3, 2017
- First published August 19, 2017.
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