1 Department of Neurology and Center of Clinical Neuroscience, First Faculty of Medicine Charles University and General University Hospital in Prague Prague Czech Republic.
2 Department of Neurology University of Groningen, University Medical Center Groningen Groningen The Netherlands.
3 Expertise Center Movement Disorders Groningen, University of Groningen, University Medical Center Groningen Groningen The Netherlands.
4 Department of Paediatrics and Adolescent Medicine, Metabolic Center, First Faculty of Medicine Charles University and General University Hospital Prague Czech Republic.
5 Department of Genetics University of Groningen, University Medical Center Groningen Groningen The Netherlands.
6 Department Pediatrics, Clinical Sciences Lund University Lund Sweden.