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.