1. Department of Orthopedics, Institute for Clinical Sciences, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
2. Department of Clinical Immunology and Transfusion Medicine, Sahlgrenska Hospital, Gothenburg, Sweden.
3. Department of Clinical Chemistry and Transfusion Medicine, Institute of Biomedicine, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
4. Department of Orthopedics, Sahlgrenska University Hospital, Gothenburg, Sweden.