[1] UCL, Ctr Hepatol, Div Med, Royal Free & Univ Coll Med Sch, London NW3 2PF, England
[2] Northwestern Univ, Chicago, IL 60611 USA
[3] UCL, Inst Hepatol, Div Med, Royal Free & Univ Coll Med Sch, London, England
[4] Univ Dusseldorf, Dept Gastroenterol Hepatol & Infectiol, D-4000 Dusseldorf, Germany
[5] Alma Mater Studiorum Univ, Unit Clin Dietet, Bologna, Italy
[6] Univ Roma La Sapienza, Div Gastroenterol, Dept Clin Med, Rome, Italy
[7] Hannover Med Sch, Dept Neurol, D-3000 Hannover, Germany