1. Center for Neuroscience and Neurological Recovery, Methodist Rehabilitation Center; 1350 E. Woodrow Wilson Drive Jackson Mississippi 39216 USA
2. Department of Neurology; Mayo Clinic Arizona; Scottsdale Arizona USA
3. Division of Research Biostatistics; Mayo Clinic Arizona; Scottsdale Arizona USA
4. Institute of Clinical Neurophysiology, Division of Neurology; University Medical Center; Ljubljana Slovenia