1. Division of Gastroenterology and Hepatology; University of Michigan; Ann Arbor MI
2. Cancer Research Center of Lyon-INSERM U1052; Hospices Civils de Lyon, Lyon University; Lyon France
3. University College London Medical School and Kings College Hospital; London UK
4. Liver Diseases Branch; National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health; Bethesda MD