1. Biomedical Engineering Laboratory, EPUSP, PTC, University of São Paulo, São Paulo, Brazil;
2. Spinal Cord Research Centre, University of Manitoba, Winnipeg, Manitoba, Canada;
3. Departamento Neurociencias, CINVESTAV-IPN, Mexico City, Mexico; and
4. Instituto de Fisiología, Benemérita Universidad Autónoma de Puebla, Puebla, Mexico