1. Institute of Neurobiology, Slovak Academy of Sciences, Kosice, Slovakia.
2. The Miami Project to Cure Paralysis, University of Miami, Miller School of Medicine, Miami, Florida.
3. Tissue Bank, Faculty of Medicine, P.J. Safarik University, and L. Pasteur Faculty Hospital, Kosice, Slovakia.
4. I Surgical Clinic, P.J. Safarik University, and L. Pasteur Faculty Hospital, Kosice, Slovakia.