[1] Univ Hosp Schleswig Holstein, Div Gastroenterol, Dept Med 1, Lubeck, Germany
[2] Ctr Gastroenterol, Herne, Germany
[3] Praxiszentrum Kaiserdamm, Berlin, Germany
[4] Ctr Internal Med, Berlin, Germany
[5] Ctr Gastroenterol & Liverctr, Berlin, Germany
[6] St Josefs Krankenhauss, Offenburg, Germany
[7] Univ Frankfurt, Frankfurt, Germany
[8] Univ Jena, Jena, Germany
[9] Krankenhaus Dresden Friedrichstadt, Dresden, Germany
[10] Ctr Gastroenterol, Leverkusen, Germany
[11] Vitanus GmbH, Frankfurt, Germany
[12] Ctr Gastroenterol, Kassel, Germany
[13] Univ Ulm, Innere Med Klin 1, Ulm, Germany
[14] Ctr HIV & Hepatogastrenterol, Dusseldorf, Germany