[1] Royal Infirm Edinburgh NHS Trust, Ctr Liver & Digest Disorders, Edinburgh EH16 4UU, Midlothian, Scotland
[2] Univ Edinburgh, Royal Infirm Edinburgh, Dept Clin Surg, Edinburgh, Midlothian, Scotland
[3] Royal Infirm Edinburgh NHS Trust, Dept Radiol, Edinburgh EH16 4UU, Midlothian, Scotland