1. Toronto Centre for Liver Disease, University of Toronto University Health Network, Toronto, Ontario, Canada;
2. Department of Medicine, Erasmus Medical Center, Rotterdam, the Netherlands;
3. Department of Biostatistics, University of Pittsburgh, Pittsburgh, Pennsylvania, USA;
4. Department of Epidemiology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA;
5. Department of Medicine, University of North Carolina, Chapel Hill, North Carolina, USA;
6. Liver Diseases Branch, NIDDK, NIH, Bethesda, Maryland, USA;
7. Department of Medicine, St. Louis University School of Medicine, St. Louis, Michigan, USA;
8. Department of Medicine, Baylor Scott and White Medical Center, Dallas, Texas, USA;
9. Department of Medicine, University of California San Francisco, San Francisco, California, USA;
10. Department of Medicine, University of Southern California, Los Angeles, California, USA;
11. Department of Medicine, University of Michigan, Ann Arbor, Michigan, USA.