[1] Aarhus Univ Hosp, Dept Clin Epidemiol, DK-8000 Aarhus, Denmark
[2] Aarhus Univ Hosp, Dept Med V Hepatol & Gastroenterol, DK-8000 Aarhus, Denmark
[3] Univ Copenhagen, Inst Publ Hlth, Dept Biostat, Copenhagen, Denmark
[4] Rigshosp, Liver Unit, DK-2100 Copenhagen, Denmark