1. Faculty of Biochemistry and Molecular Medicine, University of Oulu, FI-90014 Oulu, Finland
2. Department of Applied Physics, University of Eastern Finland, FI-70211 Kuopio, Finland
3. Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, FI-90014 Oulu, Finland
4. Department of Pathology and Medical Research Center Oulu, Oulu University Hospital, FI-90220 Oulu, Finland
5. Electron Microscopy Core Facility, Biocenter Oulu, University of Oulu, FI-90014 Oulu, Finland
6. Medical Informatics and Statistics Research group, University of Oulu, FI-90014 Oulu, Finland