1. Department of Pathology; University of Pittsburgh Medical Center; Pittsburgh PA
2. Department of Pathology; Division of Liver and Transplantation Pathology; Thomas E Starzl Transplantation; University of Pittsburgh; Pittsburgh PA
3. Laboratoire d'Anatomie Pathologique; AP-HP Hôpital Paul Brousse; Villejuif France
4. Graduate School of Public Health; Department of Epidemiology; University of Pittsburgh; Pittsburgh PA
5. Department of Surgery; University of Pittsburgh Medical Center; Pittsburgh PA