1. Department of Neurology and Neurophysiology, Karolinska University Hospital, Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden
2. Neuromuscular Centre and Clinical Genetics, Sahlgrehnska University Hospital, Gothenburg, Sweden
3. Department of Neurology, Örebro University Hospital, Örebro, Sweden
4. Department of Pharmacoepidemiology, Karolinska Institute, Stockholm, Sweden
5. Karolinska University Hospital, Centre for Inherited Metabolic Diseases, Stockholm, Sweden