Jens Minnerup1
, Heike Wersching2
and Wolf-Rüdiger Schäbitz3 
1
Department of Neurology, University Hospital Münster, Albert-Schweitzer-Straße 33, 48149 Münster, Germany
2
Institute of Epidemiology and Social Medicine, University of Münster, Domagkstraße 3, 48149 Münster, Germany
3
Department of Neurology, Evangelisches Krankenhaus Bielefeld, Burgsteig 13, 33617 Bielefeld, Germany