1. Liver Diseases BranchNational Institute of Diabetes, Digestive, and Kidney Diseases Bethesda Maryland USA
2. Department of MedicineStanford University Stanford California USA
3. Department of Microbiology and ImmunologyStanford University Stanford California USA
4. Department of MedicineVeterans Administration Medical Center Palo Alto California USA
5. Laboratory of PathologyNational Cancer Institute Bethesda Maryland USA