Affiliation: | 1. Department of Orthopaedics, Institute of Clinical Sciences, the Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden;2. Institute of Neuroscience and Physiology, Department of Neurochemistry, the Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden;3. Institute of Neuroscience and Physiology, Department of Neurochemistry, the Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden Department of Molecular Neuroscience, UCL Institute of Neurology, Queen Square, London, UK;4. Department of Orthopaedics, Institute of Clinical Sciences, the Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden Hallands Sjukhus, Kungsbacka, Sweden |