[1] Cambridge Univ Hosp, Cambridge, England
[2] St George Hosp, St Georges Vasc Inst, London, England
[3] Royal Liverpool Univ Hosp, Reg Vasc Unit, Liverpool, Merseyside, England
[4] Guys & St Thomas NHS Fdn Trust, Dept Vasc Surg, London, England
[5] Broomfield Hosp, Dept Vasc Surg, Chelmesford, Essex, England
[6] Imperial Coll Healthcare NHS Trust, St Marys Hosp, Reg Vasc Unit, London, England
[7] Freeman Rd Hosp, Newcastle Upon Tyne, Tyne & Wear, England
[8] Leicester Royal Infirm, Dept Vasc Surg, Leicester, Leics, England
[9] Portsmouth Hosp NHS Trust, Dept Vasc Surg, Portsmouth, Hants, England
[10] Doncaster & Bassetlaw Hosp NHS Trust, Dept Vasc Surg, Doncaster, England