1. Department and Institute of Physical and Rehabilitation Medicine and Naturopathy, early postacute Rehabilitation, Hospital of Nuernberg, Paracelsus Medical University, Nuernberg, Germany
2. German Institute for Health Research, Bad Elster, Germany
3. Department of Orthopedics, Physical Medicine and Rehabilitation, University Hospital Munich, Ludwig-Maximilians-University Munich, Germany
4. Institute for Medical Information Processing, Biometry and Epidemiology and German Center for Vertigo and Balance Disorders, Ludwig-Maximilians-University Munich, Germany