1. Department of Neurology, Mayo Clinic, Rochester, MN 55905, USA
2. Department of Physiology & Biomedical Engineering, Mayo Clinic, Rochester, MN 55905, USA
3. Biomedical and Electrical/Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
4. Czech Institute of Informatics, Robotics and Cybernetics, Czech Technical University, 160 00 Prague, Czech Republic
5. Department of Computing and Mathematics, FFCLRP, University of São Paulo, Ribeirão Preto 14040-901, SP, Brazil