1. Department of Physiotherapy, Sahlgrenska University Hospital, Göteborg, Sweden
2. Institute of Neuroscience and Physiology/Rehabilitation Medicine, Sahlgrenska Academy at Göteborg University, Göteborg, Sweden
3. Department of Nephrology, Sahlgrenska University Hospital, Göteborg, Sweden
4. Sunnaas Rehabilitation Hospital and the Medical Faculty, Oslo University, Oslo, Norway