[1] IFI, Leberzentrum Hamburg, Hamburg, Germany
[2] Johann Wolfgang Goethe Univ Hosp, Frankfurt, Germany
[3] Ctr HIV & Gastroenterol, Dusseldorf, Germany
[4] Ctr Gastroenterol, Kiel, Germany
[5] Ctr Gastroenterol, Leverkusen, Germany
[6] Ctr Gastroenterol, Herne, Germany