1. Department of General Surgery; Wishaw General Hospital; Wishaw UK
2. Department of General Surgery; University of Edinburgh; UK
3. Department of Clinical Surgery; University of Edinburgh; UK
4. Leeds Teaching Hospitals NHS FT, FT; Leeds UK
5. Department of Cardiology; Sheffield Teaching Hospitals NHS FT; Sheffield UK
6. School of Health and Related Research (ScHARR) University of Sheffield; Sheffield UK
7. Department of General Surgery; Sheffield Teaching Hospitals; Sheffield UK