1. Vascular Diseases Research Unit, The Institute of Cardiovascular Research, University of Dundee, Ninewells Hospital C and Medical School, Dundee, DD1 9SY, Scotland,
2. The Northern Vascular Unit, Freeman Hospital, Newcastle Upon Tyne, NE7 7DN, UK
3. Southampton University Hospitals NHS Trust, Tremona Road, Southampton, Hampshire, SO16 6YD, UK
4. Department of Surgery, Polwarth Building, University of Aberdeen, Aberdeen, AB25 2ZN, Scotland
5. Northern Vascular Centre, Freeman Hospital, Freeman Road, High Heaton, Newcastle Upon Tyne, NE7 7DN, UK
6. Wolfson Unit for Prevention of Peripheral Vascular Disease, University of Edinburgh, EH8 9AG, Scotland
7. Richford Gate Medical Practice, Richford Gate Primary Care Centre, Richford Street, London, W6 7HY, UK
8. The Circulation Foundation, 35-43 Lincoln's Inn Fields, London WC2A 3PE
9. Eastview Surgery, 81 Crosby Road North, Waterloo, Liverpool, L22 4QD, UK
10. East Barnet Health Centre, 149 East Barnet Road, New Barnet, Herts, EN4 8QZ, UK
11. 21 Beaconsfield Road, Hastings, East Sussex, TN34 3TW, UK