1. Department of Physical Medicine and Rehabilitation, Case Western Reserve University, MetroHealth Medical Center, Cleveland, Ohio, USA
2. Department of Research, Case Western Reserve University, MetroHealth Medical Center, Cleveland, Ohio, USA
3. Case Western Reserve University, MetroHealth Medical Center, Cleveland, Ohio, USA
4. Department of Neurosurgery, Case Western Reserve University, MetroHealth Medical Center, Cleveland, Ohio, USA
5. Cleveland Clinic, Cleveland, Ohio, USA