1. Institute of Dentistry University of Eastern Finland Kuopio Finland
2. Department of Oral and Maxillofacial Diseases Kuopio University Hospital Kuopio Finland
3. Hemorrhagic Brain Pathology Research Group University of Tampere Tampere Finland
4. A. I. Virtanen Institute University of Eastern Finland Kuopio Finland
5. Department of Neurosurgery Kuopio University Hospital Kuopio Finland
6. Finnish Institute for Health and Welfare Helsinki Finland
7. Oral and Maxillofacial Diseases University of Helsinki and Helsinki University Hospital Helsinki Finland
8. Department of Neurosurgery Tampere University Hospital Tampere Finland