1 Department of Medicine, University of California San Diego, La Jolla, CA, USA; Robarts Clinical Trials, Inc., London, Canada. Electronic address: nvandecasteele@ucsd.edu.
2 Tytgat Institute for Liver and Intestinal Research, Academic Medical Center, Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands. Electronic address: m.e.wildenberg@amc.uva.nl.