[1] Univ London Imperial Coll Sci Technol & Med, Dept Med, Hepatol & Gastroenterol Sect, London, England
[2] Univ London Imperial Coll Sci Technol & Med, Dept Med, Ctr Pharmacol & Therapeut, London, England
[3] Univ Oslo, Rikshosp, Oslo Univ Hosp, Div Canc Med Surg & Transplantat, N-0027 Oslo, Norway
[4] UCL, UCL Inst Hepatol, London, England