1. a Institute of Psychology, University of Oldenburg , Oldenburg, Germany
2. c Department of Neurology , Klinikum Bremen-Ost , Bremen, Germany
3. b Neurological Rehabilitation Unit , Rehabilitation Centre Oldenburg , Oldenburg, Germany
4. d Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen , Nijmegen, The Netherlands