1. Second Department of Neurology, National and Kapodistrian University of Athens, School of Medicine, Attikon University Hospital, Athens, Greece
2. Department of Physiotherapy, Laboratory of Neuromuscular and Cardiovascular Study of Motion, University of West Attica, Athens, Greece
3. First Department of Neurology, National and Kapodistrian University of Athens, School of Medicine, Eginition University Hospital, Athens, Greece