[1] Univ Hosp Birmingham, Queen Elizabeth Hosp, Liver Unit, Birmingham, W Midlands, England
[2] Univ Hosp Zurich, Zurich, Switzerland
[3] Univ Hosp Zurich, Abdominal Surg & Transplantat, Zurich, Switzerland
[4] Max Planck Inst Mol Genet, Berlin, Germany