1. Department of Neurosurgery, Section 6031, Copenhagen University Hospital, Rigshospitalet, Copenhagen;
2. Faculty of Health & Medical Sciences, University of Copenhagen; and
3. Department of Diagnostic Radiology, Section 6001, Copenhagen University Hospital, Rigshospitalet, Copenhagen;
4. Department of Mathematical Sciences, University of Copenhagen;
5. Department of Oncology, Centre for Cancer and Organ Diseases, Copenhagen University Hospital, Rigshospitalet, Copenhagen;
6. Aarhus University, Department of Public Health, Aarhus, Denmark