[1] Univ Vienna, Sch Med, Dept Internal Med 4, Div Gastroenterol & Hepatol, A-1090 Vienna, Austria
[2] Univ Vienna, Dept Radiol, Div Intervent Radiol, Vienna, Austria
[3] Kaiser Franz Josef Spital, Dept Radiol, Vienna, Austria
[4] Univ Vienna, Dept Med Stat, Vienna, Austria
[5] Donauspital, Dept Radiol, Vienna, Austria
[6] Krankenhaus Lainz, Dept Internal Med, Linz, Austria