1. Departments of Pediatrics and Anatomical Sciences and Neurobiology; University of Louisville School of Medicine; Louisville; Kentucky; 40202
2. Norton Neuroscience Institute; Norton Healthcare; Louisville; Kentucky; 40202
3. Department of Neurological Surgery; School of Medicine, University of Minnesota; Minneapolis; Minnesota; 55455
4. Spinal Cord and Brain Injury Research Group; Stark Neurosciences Research Institute and Department of Neurological Surgery, Indiana University School of Medicine; Indianapolis; Indianapolis; 46202