[1] Univ Hosp Southampton NHS Fdn Trust, Dept Radiol, Southampton, England
[2] Univ Hosp Leicester NHS Trust, Dept Radiol, Leicester, England
[3] Guys & St Thomas NHS Fdn Trust, Dept Intervent Radiol, London, England
[4] Kings Coll London, Fac Life Sci & Med, Sch Biomed Engn & Imaging Sci, London, England
[5] Hull Univ Teaching Hosp NHS Trust, Dept Vasc Radiol, Kingston Upon Hull, England
[6] Univ Hosp Dorset, Dept Radiol, Bournemouth, Dorset, England
[7] Frimley Hlth Fdn Trust, Dept Radiol, Camberley, Surrey, England
[8] Univ London, St Georges Univ Hosp NHS Fdn Trust & St Georges, Dept Radiol, London, England