1. Department of Mechanical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK
2. Leeds Vascular Institute Leeds General Infirmary, Great George Street, Leeds, LS1 3EX, UK
3. Division of Surgery, University of Warwick & University Hospitals Coventry & Warwickshire NHS Trust, Clifford Bridge Rd, Coventry, CV2 2DX, UK