1. Rehabilitation Medicine Research Center, Department of Physical Medicine & Rehabilitation, Mayo Clinic, Rochester, Minnesota, USA
2. Mayo Clinic Graduate School of Biomedical Sciences, Mayo Clinic, Rochester Minnesota, USA
3. Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, Minnesota, USA
4. Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota, USA
5. Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, Minnesota, USA