1. Neurosurgery Research Group, Biomedicum Helsinki, and Transplantation Laboratory, University of Helsinki, Helsinki, Finland
2. Neurosurgery Research Group, Biomedicum Helsinki, Helsinki, Finland
3. Transplantation Laboratory, University of Helsinki, and Department of Pulmonology, Helsinki University Central Hospital, Helsinki, Finland
4. Experimental MRI Laboratory, Department of Neurology, Helsinki University Central Hospital, Helsinki, Finland
5. Neurosurgery Research Group, Biomedicum Helsinki, and Department of Neurosurgery, Helsinki University Central Hospital, Helsinki, Finland
6. Neurosurgery Research Group, Biomedicum Helsinki, and Department of Neurosurgery, Kuopio University Hospital, Kuopio, Finland