1 Department of Health Sciences, Rehabilitation Medicine Research Group, Lund University, PO Box 157221 00, Lund, Sweden.
2 Department of Medical and Health Sciences, Athletics Research Center, Linköping University, 581 83 Linköping, Sweden.
3 Department of Medical and Health Sciences, Athletics Research Center, Linköping University, 581 83 Linköping, Sweden ; Department of Behavioural Sciences and Learning, Linköping University, 581 83 Linköping, Sweden.
4 Department of Health Sciences, Rehabilitation Medicine Research Group, Lund University, PO Box 157221 00, Lund, Sweden ; Department of Neurology and Rehabilitation Medicine, Skåne University Hospital, 221 85 Lund, Sweden ; Department of Health Science, Luleå University of Technology, 971 87 Luleå, Sweden.