1. Cardiac Surgery, Heart and Lung Center, Transplantation Laboratory, Haartman Institute; University of Helsinki, Helsinki University Central Hospital; Helsinki; Finland
2. Department of Virology; Molecular Cancer Biology Program, Research Programs Unit, Haartman Institute, University of Helsinki; Helsinki; Finland
3. Division of Pathology, Genetics; HUSLAB, Helsinki University Hospital; Helsinki; Finland
4. Institute of Biomedicine, Anatomy, University of Eastern Finland; Kuopio; Finland