1. Public Health Sciences, Centre for Population Health Sciences, University of Edinburgh Medical School, Edinburgh, UK
2. Center for Medical Decision Making, Department of Public Health, Erasmus Medical Center, Rotterdam, The Netherlands
3. Department of Neurosurgery, Virginia Commonwealth University Medical Center, Richmond, VA, USA
4. Department of Neurosurgery, University Hospital Antwerp, Edegem, Belgium
5. Public Health Sciences, Centre for Population Health Sciences, University of Edinburgh Medical School, Edinburgh, UK,