1. Department of Neurology University Hospital (Inselspital) and University of Bern Bern Switzerland
2. Neurology Clinic St Anna University Hospital Sofia Bulgaria
3. Laboratory of Cognitive Neuroscience, Center for Neuroprosthetics and Brain Mind Institute, Faculty of Life Sciences Swiss Federal institute of Technology (EPFL) Geneva Switzerland
4. Department of Neurology, Medical School University of Cyprus Nicosia Cyprus