By Wilfred M. Weinstein, MD, Professor of Medicine, Digestive Diseases,David Geffen School of Medicine at UCLA, Los Angeles, CA; Christopher J. Hawkey, DM, FRCP, Professor of Gastroenterology, Wolfson Digestive Diseases Centre, University Hospital, Nottingham, UK; and Jaime Bosch, MD, Professor of Medicine, Liver Unit, Institut de Malalties Digestives i Metaboliques, Hospital Clinic, University of Barcelona, Spain |