1. Swiss Paraplegic Center, Nottwil, Switzerland.
2. Institute of Clinical Sciences, Department of Orthopedics at the University of Gothenburg, Gothenburg, Sweden.
3. Center for Advanced Reconstruction of Extremities (CARE), Tetraplegia Hand Surgery, Sahlgrenska University Hospital and the Sahlgrenska Academy at the University of Gothenburg, Göteborg, Sweden.