Edoardo G Giannini1, R Todd Stravitz2, Stephen H Caldwell3. 1. Dipartimento di Medicina Interna, Unità di Gastroenterologia, IRCCS-Azienda Ospedaliera Universitaria San Martino-IST, Università di Genova, Genova, Italy. 2. Section of Hepatology, Division of Gastroenterology, Hepatology and Nutrition and the Hume-Lee Transplant Center, Virginia Commonwealth University, Richmond, VA. 3. Division of Gastroenterology and Hepatology, Digestive Health Center, University of Virginia, Charlottesville, VA.