1. R Banz, MSc, was Research Associate, Spinal Cord Injury Research, Balgrist University Hospital, Zurich, Switzerland, at the time of the study
2. M Bolliger, PhD, is a postdoctoral fellow at the Spinal Cord Injury Center, Balgrist University Hospital, Zurich, and at the Sensory-Motor Systems Lab, ETH Zurich, Switzerland
3. G Colombo, PhD, is Chief Executive Officer, Hocoma AG, Volketswil, Switzerland. At the time of the study, he was employed at Balgrist University Hospital, Zurich
4. V Dietz, MD, is Chair, Department of Paraplegiology, University of Zurich, Zurich, Switzerland, and Director, Spinal Cord Injury Center, Balgrist University Hospital, Zurich
5. L Lünenburger, PhD, is Head of Software Engineering, Hocoma AG. At the time of the study, he was Deputy Head of Research, Spinal Cord Injury Center, Balgrist University Hospital, Zurich