Dominic Pang1, Anthony Bleetman2, David Bleetman3, Max Wynne4. 1. Core Surgical Trainee, Department of Surgery, Aberdeen Royal Infirmary, Aberdeen. 2. Locum Consultant in Emergency Medicine, Emergency Department, Rotherham General Hospital, Rotherham S60 2UD. 3. Core Surgical Trainee, Department of Surgery, Bristol Royal Infirmary, Bristol. 4. Undergraduate Student, School of Biochemistry, Biomedical Sciences Building, University of Bristol, Bristol.