1. Department of Neurosurgery; Sahlgrenska University Hospital; Gothenburg Sweden
2. Institute of Neuroscience and Physiology; University of Gothenburg; Sahlgrenska Academy; Gothenburg Sweden
3. Department of Neuroscience, Neurology; Uppsala University; Uppsala Sweden
4. Regional Cancer Centre Stockholm; Gotland Sweden
5. Department of Radiation Science and Oncology; University hospital; Umeå Sweden
6. Department of Neurosurgery; St. Olavs University Hospital; Trondheim Norway