1. Department of Anatomy, Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, Nijmegen, The Netherlands
2. Neuropsychiatric Epidemiology Unit, Sahlgrenska Academy at University of Gothenburg, Institute for Neuroscience and Physiology, Gothenburg, Sweden
3. Department of Neurology, State University of New York, Downstate Medical Center, Brooklyn, NY, USA
4. Department of Health and Education, University of Skövde, Sweden