1. Department of Neurology Amsterdam UMC University of Amsterdam Amsterdam The Netherlands
2. Department of Neurology Helsinki University Hospital and University of Helsinki Helsinki Finland
3. Department of Clinical Neuroscience Institute of Neuroscience and Physiology, Sahlgrenska Academy at University of Gothenburg Gothenburg Sweden
4. Department of Neurology Sahlgrenska University Hospital Gothenburg Sweden
5. Department of Neurology Inselspital Bern University Hospital University of Bern Bern Switzerland
6. Sina Hospital Hamadan University of Medical Science Hamadan Iran
7. Neurosciences Department Hospital Dr R.A. Calderón Guardia CCSS San José Costa Rica
8. National Institute of Neurology and Neurosurgery Manuel Velasco Suarez Mexico City Mexico