1. Department of Medicine University of North Carolina at Chapel Hill Chapel Hill NC USA
2. Departments of Epidemiology and Biostatistics University of Pittsburgh Pittsburgh PA USA
3. Department of Internal Medicine University of Michigan Ann Arbor MI USA
4. Department of Medicine University of California at San Francisco San Francisco CA USA
5. Toronto Centre for Liver Disease University of Toronto Toronto ON Canada
6. Liver Disease Research Branch NIDDKNIH Bethesda MD USA