1. Department of Radiology, Abdominal Imaging Division, University of Pittsburgh, Pittsburgh, PA.
2. Department of Medicine, Division of General Internal Medicine, University of Pittsburgh, Pittsburgh, PA.
3. Department of Medicine, Division of Gastroenterology, Hepatology and Nutrition, Center for Liver Diseases, University of Pittsburgh Medical Center, Ste 201, Kaufmann Bldg, 3471 Fifth Ave, Pittsburgh, PA 15213.