1. Department of Physical Therapy, University of Pittsburgh, Pittsburgh, PA, USA
2. Rehabilitation Research Chair, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
3. Faculty of Rehabilitation Sciences, Department of Physical Therapy, The University of Jordan, Amman, Jordan
4. Department of Otolaryngology and Neurology, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
5. Institute for Medical Information Processing, Biometrics and Epidemiology, Ludwig-Maximilians-Universität München, Marchioninistr. Munich, Germany and the German Center for Vertigo and Balance Disorders, Ludwig-Maximilians-Universität München, Marchioninistr. Munich, Germany