[1] Ctr Gastroenterol, Kassel, Germany
[2] Ctr Gastroenterol, Gottingen, Germany
[3] Univ Med Mannheim, Med Univ Klin 2, Mannheim, Germany
[4] Ctr Gastroenterol, Bonn, Germany
[5] Univ Basel Hosp, Dept Internal Med 2, Jena, Germany
[6] Ctr Gastroenterol, Berlin, Germany
[7] Ctr Hepatol, Offenbach, Germany
[8] Univ Hosp Bonn, Dept Internal Med 1, Bonn, Germany
[9] Ctr Liver, Berlin, Germany
[10] Ctr Gastroenterol, Herne, Germany
[11] Roche Pharma AG, Virol, Grenzach Wyhlen, Germany
[12] Ctr HIV & Hepatogastroenterol, Dusseldorf, Germany