[1] Hannover Med Sch, Inst Epidemiol Sozialmed & Gesundheitssyst Forsch, D-30623 Hannover, Germany
[2] Krankenhaus NW Frankfurt, Med Klin, Frankfurt, Germany
[3] Ctr HIV & Hepatogastroenterol, Dusseldorf, Germany
[4] Liver & Study Ctr Checkpoint, Berlin, Germany
[5] Ctr Gastroenterol, Berlin, Germany
[6] Ctr Gastroenterol, Paderborn, Germany
[7] Ctr Gastroenterol, Gottingen, Germany
[8] Interdisziplinaeres Facharztzentrum Sachsenhausen, Frankfurt, Germany
[9] Ctr Gastroenterol, Bonn, Germany
[10] Ctr Gastroenterol, Dortmund, Germany
[11] Ctr Gastroenterol, Herne, Germany
[12] Factum Co Stat Sci Informat & Commun mbH, Offenbach, Germany
[13] Roche Pharma AG, Virol, Grenzach Wyhlen, Germany