1. Neurocenter, Department of Neurosurgery, Turku University Hospital, Turku, Finland
2. Department of Clinical Neurosciences, Neurosurgery Unit, University of Cambridge, Addenbrooke's Hospital, Cambridge, UK
3. Department of Medical Sciences, Section of Neurosurgery, Uppsala University, Uppsala
4. Department of Neuroscience, Karolinska institute, Stockholm
5. Department of Clinical Sciences Lund, Neurosurgery, Lund University, Department of Neurosurgery, Skåne University Hospital, Lund, Sweden