1. Neuromuscular Research Unit; Department of Neurology; 3342, Rigshospitalet Blegdamsvej 9 DK-2100 Copenhagen Denmark
2. Department of Clinical Neurophysiology; Glostrup Hospital; University of Copenhagen; Copenhagen Denmark
3. Department of Biomedicine; University of Aarhus; Aarhus Denmark
4. Department of Molecular Genetics; Rigshospitalet; University of Copenhagen; Copenhagen Denmark