1. Department of Neurology, Alfried Krupp Hospital Essen, Essen, Germany
2. Department of Neurology, University Clinic of Duesseldorf, Duesseldorf, Germany
3. Institute of Human Genetics, University of Duesseldorf, Duesseldorf, Germany
4. Institute of Human Genetics, University of Essen, Essen, Germany
5. Institute of Genetics, Stanford University School of Medicine, Stanford, CA, United States of America
6. Biomedical Data Sciences, Leiden University Medical Center, Leiden, The Nederlands