1. Health Education and Improvement Wales’ School of Surgery, Tŷ Dysgu, Cefn Coed, Nantgarw, UK
2. Neurovascular Research Laboratory, Faculty of Life Sciences and Education, University of South Wales, Treforest, UK
3. Department of Surgery, University Hospital of Wales, Cardiff, UK
4. Department of Surgery, Morriston Hospital, Swansea, UK
5. Swansea University, Singleton Park, Swansea, UK