1 Division of Physiotherapy, Department of Health and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden; Department of Orthopaedics, Sahlgrenska University Hospital, Gothenburg, Sweden; and Department of Neurobiology, Care Sciences and Society (NVS), Karolinska Institutet, Stockholm, Sweden.
2 Department of Orthopaedic Surgery, Vanderbilt University Medical Center, Nashville, Tennessee.
3 Division of Physiotherapy, Department of Health and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg.
4 Division of Physiotherapy, Department of Neurobiology, Care Sciences and Society (NVS), Karolinska Institutet; and Research and Development Unit for the Elderly, FOU nu, Stockholm County Council, Stockholm, Sweden.