1. Department of Neurology St. Josef Hospital Ruhr‐University Bochum Germany
2. Department of Neurology Katholische Kliniken Emscher‐Lippe Germany
3. Department of Neurology Agaplesion Bethesda Hospital Wuppertal Germany
4. Department of Neurology Bergmannsheil University Hospital Ruhr University Bochum Germany
5. Unidad de Enfermedades Neuromusculares Hospital de la Santa Creu i Sant Pau Barcelona Spain