1. Department of Neurology, Central Clinical Hospital of the Ministry of Interior, Warsaw, Poland
2. Neuromuscular Unit, Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland
3. Leiden University Medical Center, Center for Human and Clinical Genetics, Leiden, the Netherlands
4. Department of Neurology, Medical University of Warsaw, Warsaw, Poland
5. Department of Radiology, Central Clinical Hospital of the Ministry of Interior, Warsaw, Poland