1. Oxford Outcomes; Seacourt Tower West Way Oxford UK OX2 0JJ
2. The Freeman Hospital; Department of Vascular Surgery; Newcastle upon Tyne Hospitals NHS Foundation Trust High Heaton Newcastle upon Tyne UK NE7 7DN
3. The University of Edinburgh; Public Health Sciences, The Medical School; Teviot Place Edinburgh UK EH8 9AG
4. University of Edinburgh; Centre for Population Health Sciences; Teviot Place Edinburgh UK EH8 9AG