1. Department of Clinical Medicine; University of Bergen; Bergen Norway
2. Department of Neurobiology; Hellenic Pasteur Institute; Athens Greece
3. Tzartos NeuroDiagnostics; Athens Greece
4. Department of Neurology; Haukeland University Hospital; Bergen Norway
5. Department of Neurology; Peking University First Hospital; Beijing China
6. Department of Neurology; Affiliated Hospital of Qingdao University; Qingdao China
7. Department of Neurology; Qilu Hospital of Shandong University; Jinan China
8. University of Patras; Patras Greece