1. Department of Cellular Pathology, Queen Elizabeth Hospital Birmingham and Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, UK
2. Department of Pathology and Laboratory Medicine, Mayo Clinic Arizona, Scottsdale, Arizona, USA
3. Department of Transplant Pathology, University of Pittsburgh Medical Centre, Pittsburgh, Pennsylvania, USA
4. Department of Liver and Transplantation Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA