1. Clinical Effectiveness Unit Royal College of Surgeons of England 38‐43 Lincoln's Inn Fields, Holborn WC2A 3PE London UK
2. Hull York Medical School Hull UK
3. University of Sheffield Sheffield UK
4. Department of Vascular Surgery Cambridge University Hospitals Cambridge UK
5. Staffordshire & South Cheshire Vascular Network Royal Stoke University Hospital Stoke‐On‐Trent UK
6. Department of Health Services Research and Policy London School of Hygiene and Tropical Medicine London UK