[1] Royal Free Hosp, Royal Free Sheila Sherlock Liver Ctr, London NW3 2QG, England
[2] UCL Inst Liver & Digest Hlth, London NW3 2QG, England
[3] Univ Barcelona, Hosp Clin IDIBAPS, Hepat Hemodynam Lab, Barcelona, Spain
[4] Ctr Invest Biomed Red Enfermedades Hepat & Digest, Barcelona, Spain