1. Division of Gastroenterology and Hepatology University of Michigan Ann Arbor MI USA
2. Department of Biostatistics and Bioinformatics Duke University Medical Center Durham NC USA
3. Vanderbilt University Medical Center Nashville TN USA
4. Department of Internal Medicine University of Kentucky Louisville KY USA
5. Laboratory of Pathology National Cancer InstituteNational Institutes of Health (NIH) Bethesda MD USA
6. NIH Liver Disease Research Branch Division of Digestive Diseases and Nutrition National Institute of Diabetes and Digestive and Kidney Diseases Bethesda MD USA