[1] Leeds Teaching Hosp NHS Trust, Leeds Vasc Inst, Leeds, England
[2] Univ Leeds, Leeds Inst Clin Trials Res, Leeds, England
[3] Maastricht Univ, Dept Vasc Surg, Med Ctr, Maastricht, Netherlands
[4] Leeds Teaching Hosp NHS Trust, Leeds Gen Infirm, Leeds Vasc Inst, Great George St, Leeds LS1 3EX, England