1 Health Technology Assessment, Department of Epidemiology, University Medical Centre Groningen, University of Groningen, Groningen 9700 RB, Netherlands.
2 Department of Operations, Faculty of Economics & Business, University of Groningen, Groningen 9700 RB, Netherlands.
3 Department of Neurology, University Medical Centre Groningen, University of Groningen, Groningen 9700 RB, Netherlands.