1. Department of Neurosurgery, Neurocenter, Turku University Hospital, Turku, Finland;
2. Clinical Neurosciences, University of Turku, Turku, Finland;
3. Department of Clinical Medicine, Biostatistics, University of Turku, Turku, Finland;
4. Department of Biostatistics, University of Turku and Turku University Hospital, Turku, Finland
5. Department of Radiology, Turku University Hospital and University of Turku, Turku, Finland;
6. Department of Radiology, University of Tampere, Tampere, Finland;