1. Center for Clinical Decision Sciences, Department of Public Health, Erasmus MC, Rotterdam, The Netherlands.
2. Department of Neurological Surgery, University of Virginia, Charlottesville, Virginia.
3. Department of Neurosurgery, Virginia Commonwealth University, Richmond, Virginia.
4. Department of Community Health Sciences, University of Edinburgh, Scotland.
5. Department of Neurological Surgery, University of California, San Diego, California.
6. Department of Neurological Surgery, Erasmus Medical College, Rotterdam, The Netherlands.