1. Cochrane Vascular; University of Edinburgh; Edinburgh UK
2. Department of Health Registry Research and Development; Norwegian Institute of Public Health; Bergen Norway
3. Frimley Park Hospital NHS Foundation Trust; Surrey UK
4. Department of Clinical Biochemistry; Royal Free Hospital Campus, University College London Medical School; London UK
5. Northern Vascular Centre; Freeman Hospital; Newcastle UK
6. Usher Institute; University of Edinburgh; Edinburgh UK