1. Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases National Institutes of Health Bethesda MD
2. Hematology Branch, National Heart, Lung, and Blood Institute National Institutes of Health Bethesda MD
3. Department of Internal Medicine Medstar Washington Hospital Center Washington DC
4. Pulmonary Branch, National Heart, Lung, and Blood Institute National Institutes of Health Bethesda MD
5. Laboratory of Pathology National Cancer Institute Bethesda MD