1. Guy-Bernier Research Center, Maisonneuve-Rosemont Hospital, University of Montreal, Montreal, Quebec H3C 3J7;
2. Institution of Clinical Neuroscience, University of Göteborg, Göteborg S-41346; and
3. Centre Hospitalier de l’Université de Montréal, Pavillion Notre Dame, University of Montreal, Montreal, Quebec H1T 2M4;
4. Department of Physiology and
5. School of Physical Therapy, McGill University, Montreal, Quebec, Canada H3A 2B2;
6. Department of Neurology, Huddinge Hospital, Huddinge S-14186, Sweden