1Public Health Sciences, University of Edinburgh Medical School, Edinburgh, United Kingdom. [email protected] 2Public Health Sciences, University of Edinburgh Medical School, Edinburgh, United Kingdom.
3Department of Neurosurgery, Virginia Commonwealth University Medical School, Richmond, Virginia.
4Center for Medical Decision Making, Department of Public Health, Erasmus Medical Center, Rotterdam, The Netherlands
5Department of Neurosurgery, Erasmus Medical Center, Rotterdam, the Netherlands