1. Departments of Colorectal Surgery and Pathology, Abertawe Bro Morgannwg University Health Board, Swansea, Wales, United Kingdom
2. Cancer Biomarker Group, Institute of Life Science, School of Medicine, Swansea University, Swansea, Wales, United Kingdom
3. Pathology, Abertawe Bro Morgannwg University Health Board, Swansea, Wales, United Kingdom