1. Department of Biomedical Engineering Case Western Reserve University Cleveland Ohio USA
2. National VA Parkinson Consortium Center, Neurology Service, Daroff‐Dell'Osso Ocular Motility and Vestibular Laboratory Louis Stokes Cleveland VA Medical Center Cleveland Ohio USA
3. Department of Clinical Medicine, Center of Functionally Integrative Neuroscience Aarhus University Aarhus Denmark
4. Department of Neurology Case Western Reserve University Cleveland Ohio USA
5. Movement Disorders Center, Neurological Institute University Hospitals Cleveland Ohio USA