1 Liver Unit, Hospital Clinic of Barcelona, Institut d'Investigacions Biomèdiques August Pi i Sunyer, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas, Barcelona, Spain. Electronic address: igraupe@clinic.cat.
2 Department of Medicine II, Saarland University Medical Center, Saarland University, Homburg, Germany.