[1] Natl Hlth Serv Fdn Trust, Kings Coll Hosp, Inst Liver Studies, London SE5 8RX, England
[2] Hosp Clin Barcelona, CIBERehd Ctr Invest Biomed Red Enfermedade Hepat, IDIBAPS Inst Invest Biomed August Pi I Sunyer, Barcelona Hepat Hemodynam Lab,Liver Unit, E-08036 Barcelona, Spain