1. Department of General Surgery, Aintree University Hospital, Liverpool, UK
2. MRC North West Hub for Trials Methodology Research, Liverpool, UK
3. Department of Biostatistics, Institute of Translational Medicine, University of Liverpool, Liverpool, UK
4. NIHR Liverpool Pancreas Biomedical Research Unit, Royal Liverpool and Broadgreen University, Hospitals NHS Trust, Department of Molecular and Clinical Cancer Medicine, University of Liverpool, Liverpool, UK