1. Immunology Section, Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, DHHS, Bethesda, MD 20892, USA.
2. Pathology Core, National Heart, Lung and Blood Institute, National Institutes of Health, DHHS, Bethesda, MD 20892, USA.
3. Clinical Research Section, Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, DHHS, Bethesda, MD 20892, USA.