1. Neurocenter, Luzerner Kantonsspital, Luzern, Switzerland
2. Gerontechnology and Rehabilitation Group, University of Bern, Bern, Switzerland
3. Department of Physical Medicine and Rehabilitation, Carolinas Medical Center, Carolinas Rehabilitation, Charlotte, NC, USA
4. Department of Rehabilitation Medicine, Amsterdam Movement Sciences, Amsterdam UMC, VUmc, Amstardam, Netherlands