1. Boston University Chobanian and Avedisian School of Medicine and Boston Medical Center, United States
2. GI and Liver Unit, Institut de Malalties Digestives, Hospital Clinic, Institut d’Investigacions Biomèdiques August Pi-Sunyer (IDIBAPS), Barcelona and Ciber de Enfermedades Hepáticas y Digestivas (CIBEREHD), University of Barcelona, Barcelona, Spain