1. Medical Center Rehabilitation Hospital, Grand Forks, ND, Department of neuroscience, University of North Dakota School of Medicine, Grand Forks, ND, Department of pediatrics, University of North Dakota School of Medicine, Grand Forks, ND
2. Department of neuroscience, University of North Dakota School of Medicine, Grand Forks, ND
3. Medical Center Rehabilitation Hospital, Grand Forks, ND
4. Medical Center Rehabilitation Hospital, Grand Forks, ND, Department of physiatry University of North Dakota School of Medicine, Grand Forks, ND
5. Department of neuroscience, University of North Dakota School of Medicine