1. Department of Health Sciences, Community and Occupational Medicine, University Medical Center Groningen (UMCG), University of Groningen, Groningen, The Netherlands
2. Wenckebach Institute, University Medical Center Groningen (UMCG), University of Groningen, Groningen, The Netherlands
3. Department of Sociology, Faculty of Behavioural and Social Sciences, University of Groningen, Groningen, The Netherlands
4. Department of Neurology, University Medical Center Groningen (UMCG), University of Groningen, Groningen, The Netherlands