1. Centre for Cancer Research and Cell Biology, Queen's University Belfast, Belfast, Northern Ireland, UK
2. Department of Surgery and Cancer, Imperial College, London, UK
3. Northern Ireland Molecular Pathology Laboratory, Centre for Cancer Research and Cell Biology, Queen's University Belfast, Belfast, Northern Ireland, UK
4. Hutchison/MRC Cancer Unit, University of Cambridge, Cambridge, UK
5. Northern Ireland Cancer Centre, Belfast City Hospital, Lisburn Road, Belfast, Northern Ireland, UK
6. Centre for Public Health, Queen's University Belfast, Belfast, Northern Ireland, UK