1. Second Department of Neurology, Attikon University Hospital, School of Medicine, National and Kapodistrian University of Athens, 157 72 Athens, Greece
2. Department of Physiology, Faculty of Medicine, School of Health Sciences, University of Ioannina, 451 10 Ioannina, Greece
3. Department of Physical Therapy, University of West Attica, 122 43 Attica, Greece
4. Laboratory of Neuromuscular and Cardiovascular Study of Motion-LANECASM, University of West Attica, 122 43 Attica, Greece