1. Department of Neurophysiology; Nencki Institute of Experimental Biology PAS; 02-093 Warsaw Poland
2. Department of Nerve-Muscle Engineering; Institute of Biocybernetics and Biomedical Engineering PAS; 02-109 Warsaw Poland
3. Department of Physiology & Pathophysiology; Spinal Cord Research Centre; University of Manitoba; Winnipeg MB R3E 0J9 Canada