1. Swiss Paraplegic Research, Guido A. Zäch Institute, Nottwil, Switzerland
2. Department of Health Sciences and Medicine, University of Lucerne, Lucerne, Switzerland
3. Department of Rehabilitation, Medical University of Warsaw, Warsaw, Poland
4. Department of Research, Sunnaas Rehabilitation Hospital, Nesoddtangen, Norway
5. Faculty of Health Sciences, Klaipeda University, Klaipeda, Lithuania
6. Center of Primary and Community Care, University of Lucerne, Lucerne, Switzerland