1 Northern Ireland Molecular Pathology Laboratory, Centre for Cancer Research and Cell Biology, Queen's University Belfast, Northern Ireland BT9 7AE, UK.
2 Colorectal Cancer Focus Group, Centre for Cancer Research and Cell Biology, Queen's University Belfast, Northern Ireland BT9 7AE, UK.
3 Tissue Pathology Department, Belfast Health and Social Care Trust, Northern Ireland BT12 6BA, UK.