- Correspondence to Dr Mark G O'Doherty, Cancer Epidemiology and Health Services Research Group, Centre for Public Health, Queen's University Belfast, ICS-B Building, Royal Victoria Hospital, Grosvenor Road, Belfast BT12 6BA, Northern Ireland, UK;
- Revised November 17, 2011
- Accepted November 20, 2011
- First published December 15, 2011.
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