[1] Univ Gothenburg, Inst Neurosci & Physiol, Div Physiotherapy, Dept Hlth & Rehabil, Gothenburg, Sweden
[2] Sahlgrens Univ Hosp, Dept Orthopaed, Gothenburg, Sweden
[3] Karolinska Inst, Dept Neurobiol Care Sci & Soc NVS, Stockholm, Sweden
[4] Vanderbilt Univ, Med Ctr, Dept Orthopaed Surg, Nashville, TN USA
[5] Karolinska Inst, Div Physiotherapy, Dept Neurobiol Care Sci & Soc NVS, Stockholm, Sweden
[6] Stockholm Cty Council, Res & Dev Unit Elderly, FOU Nu, Stockholm, Sweden