1. Zurich University of Applied Sciences, Institute of Physiotherapy, Winterthur, Switzerland.
2. Spinal Cord Injury Center, Balgrist University Hospital, Zurich, Switzerland.
3. Center for Spinal Cord Injuries, Trauma Center Murnau, BG Klinikum Murnau gGmbH, Murnau am Staffelsee, Germany.
4. Institut Guttmann Hospital de Neurorehabilitació, Institut Universitari adscript a la Universitat Autònoma de Barcelona, Badalona, Spain.
5. Department of Physical Medicine and Rehabilitation, National Hospital for Paraplegics, Toledo, Spain.
6. Stoke Mandeville Spinal Research, National Spinal Injuries Centre, Buckinghamshire Healthcare Trust, NHS, Aylesbury, United Kingdom.